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Finding the Fourth Proportional to 98.73, 136.33 and 63.79

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Solution

The fourth proportional to 98.73, 136.33 and 63.79 is: 88.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.73 : 136.33 = 63.79 : x
  2. Step 2: Convert to fraction form
    98.73/136.33 = 63.79/x
  3. Step 3: Cross multiply
    98.73x = 136.33 × 63.79
  4. Step 4: Simplify right side
    98.73x = 8,695.73
  5. Step 5: Solve for x
    x = 8,695.73/98.73
  6. Step 6: Final answer
    x = 88.07

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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.