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Finding the Fourth Proportional to 509,761.20, 764,641.80 and 438,902.40

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Solution

The fourth proportional to 509,761.20, 764,641.80 and 438,902.40 is: 658,353.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,761.20 : 764,641.80 = 438,902.40 : x
  2. Step 2: Convert to fraction form
    509,761.20/764,641.80 = 438,902.40/x
  3. Step 3: Cross multiply
    509,761.20x = 764,641.80 × 438,902.40
  4. Step 4: Simplify right side
    509,761.20x = 335,603,121,160.32
  5. Step 5: Solve for x
    x = 335,603,121,160.32/509,761.20
  6. Step 6: Final answer
    x = 658,353.60

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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.