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Finding the Fourth Proportional to 98.13, 147.11 and 49.89

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Solution

The fourth proportional to 98.13, 147.11 and 49.89 is: 74.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.13 : 147.11 = 49.89 : x
  2. Step 2: Convert to fraction form
    98.13/147.11 = 49.89/x
  3. Step 3: Cross multiply
    98.13x = 147.11 × 49.89
  4. Step 4: Simplify right side
    98.13x = 7,339.07
  5. Step 5: Solve for x
    x = 7,339.07/98.13
  6. Step 6: Final answer
    x = 74.79

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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.