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Finding the Fourth Proportional to 138,877.16, 191,691.06 and 81,531.32

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Solution

The fourth proportional to 138,877.16, 191,691.06 and 81,531.32 is: 112,537.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,877.16 : 191,691.06 = 81,531.32 : x
  2. Step 2: Convert to fraction form
    138,877.16/191,691.06 = 81,531.32/x
  3. Step 3: Cross multiply
    138,877.16x = 191,691.06 × 81,531.32
  4. Step 4: Simplify right side
    138,877.16x = 15,628,825,154.00
  5. Step 5: Solve for x
    x = 15,628,825,154.00/138,877.16
  6. Step 6: Final answer
    x = 112,537.04

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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.