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Finding the Fourth Proportional to 763,651.40, 1,145,477.10 and 427,728.20

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Solution

The fourth proportional to 763,651.40, 1,145,477.10 and 427,728.20 is: 641,592.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    763,651.40 : 1,145,477.10 = 427,728.20 : x
  2. Step 2: Convert to fraction form
    763,651.40/1,145,477.10 = 427,728.20/x
  3. Step 3: Cross multiply
    763,651.40x = 1,145,477.10 × 427,728.20
  4. Step 4: Simplify right side
    763,651.40x = 489,952,858,124.22
  5. Step 5: Solve for x
    x = 489,952,858,124.22/763,651.40
  6. Step 6: Final answer
    x = 641,592.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.