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Finding the Fourth Proportional to 439,781.80, 659,672.70 and 389,918.20

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Solution

The fourth proportional to 439,781.80, 659,672.70 and 389,918.20 is: 584,877.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,781.80 : 659,672.70 = 389,918.20 : x
  2. Step 2: Convert to fraction form
    439,781.80/659,672.70 = 389,918.20/x
  3. Step 3: Cross multiply
    439,781.80x = 659,672.70 × 389,918.20
  4. Step 4: Simplify right side
    439,781.80x = 257,218,391,773.14
  5. Step 5: Solve for x
    x = 257,218,391,773.14/439,781.80
  6. Step 6: Final answer
    x = 584,877.30

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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.