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Finding the Fourth Proportional to 92.38, 127.74 and 87.98

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Solution

The fourth proportional to 92.38, 127.74 and 87.98 is: 121.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.38 : 127.74 = 87.98 : x
  2. Step 2: Convert to fraction form
    92.38/127.74 = 87.98/x
  3. Step 3: Cross multiply
    92.38x = 127.74 × 87.98
  4. Step 4: Simplify right side
    92.38x = 11,238.57
  5. Step 5: Solve for x
    x = 11,238.57/92.38
  6. Step 6: Final answer
    x = 121.66

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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.