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Finding the Fourth Proportional to 92.78, 127.94 and 73.12

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Solution

The fourth proportional to 92.78, 127.94 and 73.12 is: 100.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.78 : 127.94 = 73.12 : x
  2. Step 2: Convert to fraction form
    92.78/127.94 = 73.12/x
  3. Step 3: Cross multiply
    92.78x = 127.94 × 73.12
  4. Step 4: Simplify right side
    92.78x = 9,354.29
  5. Step 5: Solve for x
    x = 9,354.29/92.78
  6. Step 6: Final answer
    x = 100.82

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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.