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Finding the Fourth Proportional to 138,686.85, 191,387.21 and 75,024.09

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Solution

The fourth proportional to 138,686.85, 191,387.21 and 75,024.09 is: 103,532.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,686.85 : 191,387.21 = 75,024.09 : x
  2. Step 2: Convert to fraction form
    138,686.85/191,387.21 = 75,024.09/x
  3. Step 3: Cross multiply
    138,686.85x = 191,387.21 × 75,024.09
  4. Step 4: Simplify right side
    138,686.85x = 14,358,650,892.77
  5. Step 5: Solve for x
    x = 14,358,650,892.77/138,686.85
  6. Step 6: Final answer
    x = 103,532.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.