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Finding the Fourth Proportional to 138,722.88, 191,436.96 and 75,061.80

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Solution

The fourth proportional to 138,722.88, 191,436.96 and 75,061.80 is: 103,584.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,722.88 : 191,436.96 = 75,061.80 : x
  2. Step 2: Convert to fraction form
    138,722.88/191,436.96 = 75,061.80/x
  3. Step 3: Cross multiply
    138,722.88x = 191,436.96 × 75,061.80
  4. Step 4: Simplify right side
    138,722.88x = 14,369,602,804.13
  5. Step 5: Solve for x
    x = 14,369,602,804.13/138,722.88
  6. Step 6: Final answer
    x = 103,584.95

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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.