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Finding the Fourth Proportional to 99,321.54, 136,969.74 and 63,449.28

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Solution

The fourth proportional to 99,321.54, 136,969.74 and 63,449.28 is: 87,499.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,321.54 : 136,969.74 = 63,449.28 : x
  2. Step 2: Convert to fraction form
    99,321.54/136,969.74 = 63,449.28/x
  3. Step 3: Cross multiply
    99,321.54x = 136,969.74 × 63,449.28
  4. Step 4: Simplify right side
    99,321.54x = 8,690,631,384.79
  5. Step 5: Solve for x
    x = 8,690,631,384.79/99,321.54
  6. Step 6: Final answer
    x = 87,499.97

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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.