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Finding the Fourth Proportional to 92.75, 127.97 and 55.90

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Solution

The fourth proportional to 92.75, 127.97 and 55.90 is: 77.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.75 : 127.97 = 55.90 : x
  2. Step 2: Convert to fraction form
    92.75/127.97 = 55.90/x
  3. Step 3: Cross multiply
    92.75x = 127.97 × 55.90
  4. Step 4: Simplify right side
    92.75x = 7,153.52
  5. Step 5: Solve for x
    x = 7,153.52/92.75
  6. Step 6: Final answer
    x = 77.13

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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.