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Finding the Fourth Proportional to 98.73, 148.24 and 78.61

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Solution

The fourth proportional to 98.73, 148.24 and 78.61 is: 118.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.73 : 148.24 = 78.61 : x
  2. Step 2: Convert to fraction form
    98.73/148.24 = 78.61/x
  3. Step 3: Cross multiply
    98.73x = 148.24 × 78.61
  4. Step 4: Simplify right side
    98.73x = 11,652.41
  5. Step 5: Solve for x
    x = 11,652.41/98.73
  6. Step 6: Final answer
    x = 118.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.