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Finding the Fourth Proportional to 138,937.52, 191,734.80 and 75,275.72

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Solution

The fourth proportional to 138,937.52, 191,734.80 and 75,275.72 is: 103,881.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,937.52 : 191,734.80 = 75,275.72 : x
  2. Step 2: Convert to fraction form
    138,937.52/191,734.80 = 75,275.72/x
  3. Step 3: Cross multiply
    138,937.52x = 191,734.80 × 75,275.72
  4. Step 4: Simplify right side
    138,937.52x = 14,432,975,119.06
  5. Step 5: Solve for x
    x = 14,432,975,119.06/138,937.52
  6. Step 6: Final answer
    x = 103,881.05

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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.