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Finding the Fourth Proportional to 138,709.68, 208,406.88 and 88,811.52

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Solution

The fourth proportional to 138,709.68, 208,406.88 and 88,811.52 is: 133,436.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,709.68 : 208,406.88 = 88,811.52 : x
  2. Step 2: Convert to fraction form
    138,709.68/208,406.88 = 88,811.52/x
  3. Step 3: Cross multiply
    138,709.68x = 208,406.88 × 88,811.52
  4. Step 4: Simplify right side
    138,709.68x = 18,508,931,791.26
  5. Step 5: Solve for x
    x = 18,508,931,791.26/138,709.68
  6. Step 6: Final answer
    x = 133,436.48

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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.