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Finding the Fourth Proportional to 98.29, 147.74 and 81.28

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Solution

The fourth proportional to 98.29, 147.74 and 81.28 is: 122.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.29 : 147.74 = 81.28 : x
  2. Step 2: Convert to fraction form
    98.29/147.74 = 81.28/x
  3. Step 3: Cross multiply
    98.29x = 147.74 × 81.28
  4. Step 4: Simplify right side
    98.29x = 12,007.90
  5. Step 5: Solve for x
    x = 12,007.90/98.29
  6. Step 6: Final answer
    x = 122.17

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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.