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Finding the Fourth Proportional to 138,711.68, 208,409.88 and 88,813.52

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Solution

The fourth proportional to 138,711.68, 208,409.88 and 88,813.52 is: 133,439.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,711.68 : 208,409.88 = 88,813.52 : x
  2. Step 2: Convert to fraction form
    138,711.68/208,409.88 = 88,813.52/x
  3. Step 3: Cross multiply
    138,711.68x = 208,409.88 × 88,813.52
  4. Step 4: Simplify right side
    138,711.68x = 18,509,615,045.58
  5. Step 5: Solve for x
    x = 18,509,615,045.58/138,711.68
  6. Step 6: Final answer
    x = 133,439.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.