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Finding the Fourth Proportional to 106.71, 158.99 and 99.72

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Solution

The fourth proportional to 106.71, 158.99 and 99.72 is: 148.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.71 : 158.99 = 99.72 : x
  2. Step 2: Convert to fraction form
    106.71/158.99 = 99.72/x
  3. Step 3: Cross multiply
    106.71x = 158.99 × 99.72
  4. Step 4: Simplify right side
    106.71x = 15,853.98
  5. Step 5: Solve for x
    x = 15,853.98/106.71
  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.