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Finding the Fourth Proportional to 140.08, 193.28 and 81.88

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Solution

The fourth proportional to 140.08, 193.28 and 81.88 is: 112.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.08 : 193.28 = 81.88 : x
  2. Step 2: Convert to fraction form
    140.08/193.28 = 81.88/x
  3. Step 3: Cross multiply
    140.08x = 193.28 × 81.88
  4. Step 4: Simplify right side
    140.08x = 15,825.77
  5. Step 5: Solve for x
    x = 15,825.77/140.08
  6. Step 6: Final answer
    x = 112.98

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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.