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Finding the Fourth Proportional to 99,187.28, 136,879.38 and 53,865.66

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Solution

The fourth proportional to 99,187.28, 136,879.38 and 53,865.66 is: 74,335.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,187.28 : 136,879.38 = 53,865.66 : x
  2. Step 2: Convert to fraction form
    99,187.28/136,879.38 = 53,865.66/x
  3. Step 3: Cross multiply
    99,187.28x = 136,879.38 × 53,865.66
  4. Step 4: Simplify right side
    99,187.28x = 7,373,098,144.09
  5. Step 5: Solve for x
    x = 7,373,098,144.09/99,187.28
  6. Step 6: Final answer
    x = 74,335.12

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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.