Home / 828,005.20-1,242,007.80-509,140.60

Finding the Fourth Proportional to 828,005.20, 1,242,007.80 and 509,140.60

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Solution

The fourth proportional to 828,005.20, 1,242,007.80 and 509,140.60 is: 763,710.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    828,005.20 : 1,242,007.80 = 509,140.60 : x
  2. Step 2: Convert to fraction form
    828,005.20/1,242,007.80 = 509,140.60/x
  3. Step 3: Cross multiply
    828,005.20x = 1,242,007.80 × 509,140.60
  4. Step 4: Simplify right side
    828,005.20x = 632,356,596,496.68
  5. Step 5: Solve for x
    x = 632,356,596,496.68/828,005.20
  6. Step 6: Final answer
    x = 763,710.90

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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.