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Finding the Fourth Proportional to 92.50, 127.56 and 83.78

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Solution

The fourth proportional to 92.50, 127.56 and 83.78 is: 115.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.50 : 127.56 = 83.78 : x
  2. Step 2: Convert to fraction form
    92.50/127.56 = 83.78/x
  3. Step 3: Cross multiply
    92.50x = 127.56 × 83.78
  4. Step 4: Simplify right side
    92.50x = 10,686.98
  5. Step 5: Solve for x
    x = 10,686.98/92.50
  6. Step 6: Final answer
    x = 115.53

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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.