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Finding the Fourth Proportional to 138,145.93, 190,641.68 and 81,560.95

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Solution

The fourth proportional to 138,145.93, 190,641.68 and 81,560.95 is: 112,554.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,145.93 : 190,641.68 = 81,560.95 : x
  2. Step 2: Convert to fraction form
    138,145.93/190,641.68 = 81,560.95/x
  3. Step 3: Cross multiply
    138,145.93x = 190,641.68 × 81,560.95
  4. Step 4: Simplify right side
    138,145.93x = 15,548,916,530.40
  5. Step 5: Solve for x
    x = 15,548,916,530.40/138,145.93
  6. Step 6: Final answer
    x = 112,554.29

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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.