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Finding the Fourth Proportional to 106.80, 159.42 and 98.88

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Solution

The fourth proportional to 106.80, 159.42 and 98.88 is: 147.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.80 : 159.42 = 98.88 : x
  2. Step 2: Convert to fraction form
    106.80/159.42 = 98.88/x
  3. Step 3: Cross multiply
    106.80x = 159.42 × 98.88
  4. Step 4: Simplify right side
    106.80x = 15,763.45
  5. Step 5: Solve for x
    x = 15,763.45/106.80
  6. Step 6: Final answer
    x = 147.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.