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Finding the Fourth Proportional to 138,663.90, 191,304.87 and 90,943.74

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Solution

The fourth proportional to 138,663.90, 191,304.87 and 90,943.74 is: 125,468.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,663.90 : 191,304.87 = 90,943.74 : x
  2. Step 2: Convert to fraction form
    138,663.90/191,304.87 = 90,943.74/x
  3. Step 3: Cross multiply
    138,663.90x = 191,304.87 × 90,943.74
  4. Step 4: Simplify right side
    138,663.90x = 17,397,980,358.01
  5. Step 5: Solve for x
    x = 17,397,980,358.01/138,663.90
  6. Step 6: Final answer
    x = 125,468.71

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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.