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Finding the Fourth Proportional to 539,430.40, 807,763.20 and 398,425.60

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Solution

The fourth proportional to 539,430.40, 807,763.20 and 398,425.60 is: 596,617.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,430.40 : 807,763.20 = 398,425.60 : x
  2. Step 2: Convert to fraction form
    539,430.40/807,763.20 = 398,425.60/x
  3. Step 3: Cross multiply
    539,430.40x = 807,763.20 × 398,425.60
  4. Step 4: Simplify right side
    539,430.40x = 321,833,537,617.92
  5. Step 5: Solve for x
    x = 321,833,537,617.92/539,430.40
  6. Step 6: Final answer
    x = 596,617.35

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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.