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Finding the Fourth Proportional to 402,860.20, 604,290.30 and 261,142.60

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Solution

The fourth proportional to 402,860.20, 604,290.30 and 261,142.60 is: 391,713.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,860.20 : 604,290.30 = 261,142.60 : x
  2. Step 2: Convert to fraction form
    402,860.20/604,290.30 = 261,142.60/x
  3. Step 3: Cross multiply
    402,860.20x = 604,290.30 × 261,142.60
  4. Step 4: Simplify right side
    402,860.20x = 157,805,940,096.78
  5. Step 5: Solve for x
    x = 157,805,940,096.78/402,860.20
  6. Step 6: Final answer
    x = 391,713.90

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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.