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Finding the Fourth Proportional to 99,996.80, 138,098.88 and 86,503.20

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Solution

The fourth proportional to 99,996.80, 138,098.88 and 86,503.20 is: 119,463.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,996.80 : 138,098.88 = 86,503.20 : x
  2. Step 2: Convert to fraction form
    99,996.80/138,098.88 = 86,503.20/x
  3. Step 3: Cross multiply
    99,996.80x = 138,098.88 × 86,503.20
  4. Step 4: Simplify right side
    99,996.80x = 11,945,995,036.42
  5. Step 5: Solve for x
    x = 11,945,995,036.42/99,996.80
  6. Step 6: Final answer
    x = 119,463.77

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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.