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Finding the Fourth Proportional to 92.70, 138.84 and 74.58

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Solution

The fourth proportional to 92.70, 138.84 and 74.58 is: 111.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.70 : 138.84 = 74.58 : x
  2. Step 2: Convert to fraction form
    92.70/138.84 = 74.58/x
  3. Step 3: Cross multiply
    92.70x = 138.84 × 74.58
  4. Step 4: Simplify right side
    92.70x = 10,354.69
  5. Step 5: Solve for x
    x = 10,354.69/92.70
  6. Step 6: Final answer
    x = 111.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.