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Finding the Fourth Proportional to 138,989.69, 208,715.17 and 86,731.32

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Solution

The fourth proportional to 138,989.69, 208,715.17 and 86,731.32 is: 130,240.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,989.69 : 208,715.17 = 86,731.32 : x
  2. Step 2: Convert to fraction form
    138,989.69/208,715.17 = 86,731.32/x
  3. Step 3: Cross multiply
    138,989.69x = 208,715.17 × 86,731.32
  4. Step 4: Simplify right side
    138,989.69x = 18,102,142,198.12
  5. Step 5: Solve for x
    x = 18,102,142,198.12/138,989.69
  6. Step 6: Final answer
    x = 130,240.90

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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.