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Finding the Fourth Proportional to 101.67, 139.38 and 99.83

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Solution

The fourth proportional to 101.67, 139.38 and 99.83 is: 136.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.67 : 139.38 = 99.83 : x
  2. Step 2: Convert to fraction form
    101.67/139.38 = 99.83/x
  3. Step 3: Cross multiply
    101.67x = 139.38 × 99.83
  4. Step 4: Simplify right side
    101.67x = 13,913.81
  5. Step 5: Solve for x
    x = 13,913.81/101.67
  6. Step 6: Final answer
    x = 136.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.