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Finding the Fourth Proportional to 99,138.47, 136,753.82 and 63,288.07

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Solution

The fourth proportional to 99,138.47, 136,753.82 and 63,288.07 is: 87,300.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,138.47 : 136,753.82 = 63,288.07 : x
  2. Step 2: Convert to fraction form
    99,138.47/136,753.82 = 63,288.07/x
  3. Step 3: Cross multiply
    99,138.47x = 136,753.82 × 63,288.07
  4. Step 4: Simplify right side
    99,138.47x = 8,654,884,674.60
  5. Step 5: Solve for x
    x = 8,654,884,674.60/99,138.47
  6. Step 6: Final answer
    x = 87,300.98

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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.