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Finding the Fourth Proportional to 106.08, 158.90 and 99.70

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Solution

The fourth proportional to 106.08, 158.90 and 99.70 is: 149.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.08 : 158.90 = 99.70 : x
  2. Step 2: Convert to fraction form
    106.08/158.90 = 99.70/x
  3. Step 3: Cross multiply
    106.08x = 158.90 × 99.70
  4. Step 4: Simplify right side
    106.08x = 15,842.33
  5. Step 5: Solve for x
    x = 15,842.33/106.08
  6. Step 6: Final answer
    x = 149.34

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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.