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Finding the Fourth Proportional to 98.19, 147.20 and 66.20

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Solution

The fourth proportional to 98.19, 147.20 and 66.20 is: 99.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.19 : 147.20 = 66.20 : x
  2. Step 2: Convert to fraction form
    98.19/147.20 = 66.20/x
  3. Step 3: Cross multiply
    98.19x = 147.20 × 66.20
  4. Step 4: Simplify right side
    98.19x = 9,743.57
  5. Step 5: Solve for x
    x = 9,743.57/98.19
  6. Step 6: Final answer
    x = 99.23

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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.