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Finding the Fourth Proportional to 101.42, 139.03 and 99.58

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Solution

The fourth proportional to 101.42, 139.03 and 99.58 is: 136.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.42 : 139.03 = 99.58 : x
  2. Step 2: Convert to fraction form
    101.42/139.03 = 99.58/x
  3. Step 3: Cross multiply
    101.42x = 139.03 × 99.58
  4. Step 4: Simplify right side
    101.42x = 13,844.61
  5. Step 5: Solve for x
    x = 13,844.61/101.42
  6. Step 6: Final answer
    x = 136.51

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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.