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Finding the Fourth Proportional to 636,990.40, 955,485.60 and 257,910.40

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Solution

The fourth proportional to 636,990.40, 955,485.60 and 257,910.40 is: 386,865.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,990.40 : 955,485.60 = 257,910.40 : x
  2. Step 2: Convert to fraction form
    636,990.40/955,485.60 = 257,910.40/x
  3. Step 3: Cross multiply
    636,990.40x = 955,485.60 × 257,910.40
  4. Step 4: Simplify right side
    636,990.40x = 246,429,673,290.24
  5. Step 5: Solve for x
    x = 246,429,673,290.24/636,990.40
  6. Step 6: Final answer
    x = 386,865.60

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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.