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Finding the Fourth Proportional to 218,839.59, 328,127.96 and 85,561.04

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Solution

The fourth proportional to 218,839.59, 328,127.96 and 85,561.04 is: 128,290.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,839.59 : 328,127.96 = 85,561.04 : x
  2. Step 2: Convert to fraction form
    218,839.59/328,127.96 = 85,561.04/x
  3. Step 3: Cross multiply
    218,839.59x = 328,127.96 × 85,561.04
  4. Step 4: Simplify right side
    218,839.59x = 28,074,970,544.90
  5. Step 5: Solve for x
    x = 28,074,970,544.90/218,839.59
  6. Step 6: Final answer
    x = 128,290.18

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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.