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Finding the Fourth Proportional to 138,527.25, 191,167.65 and 78,911.25

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Solution

The fourth proportional to 138,527.25, 191,167.65 and 78,911.25 is: 108,897.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,527.25 : 191,167.65 = 78,911.25 : x
  2. Step 2: Convert to fraction form
    138,527.25/191,167.65 = 78,911.25/x
  3. Step 3: Cross multiply
    138,527.25x = 191,167.65 × 78,911.25
  4. Step 4: Simplify right side
    138,527.25x = 15,085,278,221.06
  5. Step 5: Solve for x
    x = 15,085,278,221.06/138,527.25
  6. Step 6: Final answer
    x = 108,897.55

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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.