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Finding the Fourth Proportional to 539,442.40, 807,781.20 and 398,437.60

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Solution

The fourth proportional to 539,442.40, 807,781.20 and 398,437.60 is: 596,635.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,442.40 : 807,781.20 = 398,437.60 : x
  2. Step 2: Convert to fraction form
    539,442.40/807,781.20 = 398,437.60/x
  3. Step 3: Cross multiply
    539,442.40x = 807,781.20 × 398,437.60
  4. Step 4: Simplify right side
    539,442.40x = 321,850,402,653.12
  5. Step 5: Solve for x
    x = 321,850,402,653.12/539,442.40
  6. Step 6: Final answer
    x = 596,635.35

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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.