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Finding the Fourth Proportional to 99,428.97, 149,143.47 and 81,861.93

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Solution

The fourth proportional to 99,428.97, 149,143.47 and 81,861.93 is: 122,792.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,428.97 : 149,143.47 = 81,861.93 : x
  2. Step 2: Convert to fraction form
    99,428.97/149,143.47 = 81,861.93/x
  3. Step 3: Cross multiply
    99,428.97x = 149,143.47 × 81,861.93
  4. Step 4: Simplify right side
    99,428.97x = 12,209,172,301.10
  5. Step 5: Solve for x
    x = 12,209,172,301.10/99,428.97
  6. Step 6: Final answer
    x = 122,792.91

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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.