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Finding the Fourth Proportional to 98.80, 147.87 and 71.30

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Solution

The fourth proportional to 98.80, 147.87 and 71.30 is: 106.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.80 : 147.87 = 71.30 : x
  2. Step 2: Convert to fraction form
    98.80/147.87 = 71.30/x
  3. Step 3: Cross multiply
    98.80x = 147.87 × 71.30
  4. Step 4: Simplify right side
    98.80x = 10,543.13
  5. Step 5: Solve for x
    x = 10,543.13/98.80
  6. Step 6: Final answer
    x = 106.71

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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.