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Finding the Fourth Proportional to 106.42, 158.50 and 99.76

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Solution

The fourth proportional to 106.42, 158.50 and 99.76 is: 148.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.42 : 158.50 = 99.76 : x
  2. Step 2: Convert to fraction form
    106.42/158.50 = 99.76/x
  3. Step 3: Cross multiply
    106.42x = 158.50 × 99.76
  4. Step 4: Simplify right side
    106.42x = 15,811.96
  5. Step 5: Solve for x
    x = 15,811.96/106.42
  6. Step 6: Final answer
    x = 148.58

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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.