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Finding the Fourth Proportional to 129,179.70, 193,564.89 and 99,669.78

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Solution

The fourth proportional to 129,179.70, 193,564.89 and 99,669.78 is: 149,346.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,179.70 : 193,564.89 = 99,669.78 : x
  2. Step 2: Convert to fraction form
    129,179.70/193,564.89 = 99,669.78/x
  3. Step 3: Cross multiply
    129,179.70x = 193,564.89 × 99,669.78
  4. Step 4: Simplify right side
    129,179.70x = 19,292,570,002.02
  5. Step 5: Solve for x
    x = 19,292,570,002.02/129,179.70
  6. Step 6: Final answer
    x = 149,346.76

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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.