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Finding the Fourth Proportional to 101.34, 140.40 and 99.18

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Solution

The fourth proportional to 101.34, 140.40 and 99.18 is: 137.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.34 : 140.40 = 99.18 : x
  2. Step 2: Convert to fraction form
    101.34/140.40 = 99.18/x
  3. Step 3: Cross multiply
    101.34x = 140.40 × 99.18
  4. Step 4: Simplify right side
    101.34x = 13,924.87
  5. Step 5: Solve for x
    x = 13,924.87/101.34
  6. Step 6: Final answer
    x = 137.41

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.