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Finding the Fourth Proportional to 138,449.69, 191,060.67 and 74,787.48

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Solution

The fourth proportional to 138,449.69, 191,060.67 and 74,787.48 is: 103,206.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,449.69 : 191,060.67 = 74,787.48 : x
  2. Step 2: Convert to fraction form
    138,449.69/191,060.67 = 74,787.48/x
  3. Step 3: Cross multiply
    138,449.69x = 191,060.67 × 74,787.48
  4. Step 4: Simplify right side
    138,449.69x = 14,288,946,036.41
  5. Step 5: Solve for x
    x = 14,288,946,036.41/138,449.69
  6. Step 6: Final answer
    x = 103,206.78

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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.