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Finding the Fourth Proportional to 98.53, 147.49 and 54.55

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Solution

The fourth proportional to 98.53, 147.49 and 54.55 is: 81.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.53 : 147.49 = 54.55 : x
  2. Step 2: Convert to fraction form
    98.53/147.49 = 54.55/x
  3. Step 3: Cross multiply
    98.53x = 147.49 × 54.55
  4. Step 4: Simplify right side
    98.53x = 8,044.84
  5. Step 5: Solve for x
    x = 8,044.84/98.53
  6. Step 6: Final answer
    x = 81.65

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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.