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Finding the Fourth Proportional to 138,998.40, 208,497.60 and 132,931.20

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Solution

The fourth proportional to 138,998.40, 208,497.60 and 132,931.20 is: 199,396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,998.40 : 208,497.60 = 132,931.20 : x
  2. Step 2: Convert to fraction form
    138,998.40/208,497.60 = 132,931.20/x
  3. Step 3: Cross multiply
    138,998.40x = 208,497.60 × 132,931.20
  4. Step 4: Simplify right side
    138,998.40x = 27,715,836,165.12
  5. Step 5: Solve for x
    x = 27,715,836,165.12/138,998.40
  6. Step 6: Final answer
    x = 199,396.80

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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.