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Finding the Fourth Proportional to 106.62, 158.81 and 105.20

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Solution

The fourth proportional to 106.62, 158.81 and 105.20 is: 156.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.62 : 158.81 = 105.20 : x
  2. Step 2: Convert to fraction form
    106.62/158.81 = 105.20/x
  3. Step 3: Cross multiply
    106.62x = 158.81 × 105.20
  4. Step 4: Simplify right side
    106.62x = 16,706.68
  5. Step 5: Solve for x
    x = 16,706.68/106.62
  6. Step 6: Final answer
    x = 156.70

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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.