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Finding the Fourth Proportional to 101.54, 140.14 and 85.13

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Solution

The fourth proportional to 101.54, 140.14 and 85.13 is: 117.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.54 : 140.14 = 85.13 : x
  2. Step 2: Convert to fraction form
    101.54/140.14 = 85.13/x
  3. Step 3: Cross multiply
    101.54x = 140.14 × 85.13
  4. Step 4: Simplify right side
    101.54x = 11,930.57
  5. Step 5: Solve for x
    x = 11,930.57/101.54
  6. Step 6: Final answer
    x = 117.50

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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.