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Finding the Fourth Proportional to 133,061.10, 199,591.65 and 85,821.90

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Solution

The fourth proportional to 133,061.10, 199,591.65 and 85,821.90 is: 128,732.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,061.10 : 199,591.65 = 85,821.90 : x
  2. Step 2: Convert to fraction form
    133,061.10/199,591.65 = 85,821.90/x
  3. Step 3: Cross multiply
    133,061.10x = 199,591.65 × 85,821.90
  4. Step 4: Simplify right side
    133,061.10x = 17,129,334,627.14
  5. Step 5: Solve for x
    x = 17,129,334,627.14/133,061.10
  6. Step 6: Final answer
    x = 128,732.85

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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.