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Finding the Fourth Proportional to 92.57, 127.46 and 86.19

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Solution

The fourth proportional to 92.57, 127.46 and 86.19 is: 118.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.57 : 127.46 = 86.19 : x
  2. Step 2: Convert to fraction form
    92.57/127.46 = 86.19/x
  3. Step 3: Cross multiply
    92.57x = 127.46 × 86.19
  4. Step 4: Simplify right side
    92.57x = 10,985.75
  5. Step 5: Solve for x
    x = 10,985.75/92.57
  6. Step 6: Final answer
    x = 118.68

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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.