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Finding the Fourth Proportional to 106.20, 158.49 and 100.80

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Solution

The fourth proportional to 106.20, 158.49 and 100.80 is: 150.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.20 : 158.49 = 100.80 : x
  2. Step 2: Convert to fraction form
    106.20/158.49 = 100.80/x
  3. Step 3: Cross multiply
    106.20x = 158.49 × 100.80
  4. Step 4: Simplify right side
    106.20x = 15,975.79
  5. Step 5: Solve for x
    x = 15,975.79/106.20
  6. Step 6: Final answer
    x = 150.43

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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.