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Finding the Fourth Proportional to 140.48, 193.87 and 85.18

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Solution

The fourth proportional to 140.48, 193.87 and 85.18 is: 117.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.48 : 193.87 = 85.18 : x
  2. Step 2: Convert to fraction form
    140.48/193.87 = 85.18/x
  3. Step 3: Cross multiply
    140.48x = 193.87 × 85.18
  4. Step 4: Simplify right side
    140.48x = 16,513.85
  5. Step 5: Solve for x
    x = 16,513.85/140.48
  6. Step 6: Final answer
    x = 117.55

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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.