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Finding the Fourth Proportional to 98.76, 147.96 and 81.54

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Solution

The fourth proportional to 98.76, 147.96 and 81.54 is: 122.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.76 : 147.96 = 81.54 : x
  2. Step 2: Convert to fraction form
    98.76/147.96 = 81.54/x
  3. Step 3: Cross multiply
    98.76x = 147.96 × 81.54
  4. Step 4: Simplify right side
    98.76x = 12,064.66
  5. Step 5: Solve for x
    x = 12,064.66/98.76
  6. Step 6: Final answer
    x = 122.16

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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.