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Finding the Fourth Proportional to 90,943.97, 135,704.71 and 81,487.66

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Solution

The fourth proportional to 90,943.97, 135,704.71 and 81,487.66 is: 121,594.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,943.97 : 135,704.71 = 81,487.66 : x
  2. Step 2: Convert to fraction form
    90,943.97/135,704.71 = 81,487.66/x
  3. Step 3: Cross multiply
    90,943.97x = 135,704.71 × 81,487.66
  4. Step 4: Simplify right side
    90,943.97x = 11,058,259,642.03
  5. Step 5: Solve for x
    x = 11,058,259,642.03/90,943.97
  6. Step 6: Final answer
    x = 121,594.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.