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Finding the Fourth Proportional to 106.83, 147.49 and 99.87

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Solution

The fourth proportional to 106.83, 147.49 and 99.87 is: 137.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.83 : 147.49 = 99.87 : x
  2. Step 2: Convert to fraction form
    106.83/147.49 = 99.87/x
  3. Step 3: Cross multiply
    106.83x = 147.49 × 99.87
  4. Step 4: Simplify right side
    106.83x = 14,729.58
  5. Step 5: Solve for x
    x = 14,729.58/106.83
  6. Step 6: Final answer
    x = 137.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.