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Finding the Fourth Proportional to 85.16, 127.18 and 76.12

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Solution

The fourth proportional to 85.16, 127.18 and 76.12 is: 113.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.16 : 127.18 = 76.12 : x
  2. Step 2: Convert to fraction form
    85.16/127.18 = 76.12/x
  3. Step 3: Cross multiply
    85.16x = 127.18 × 76.12
  4. Step 4: Simplify right side
    85.16x = 9,680.94
  5. Step 5: Solve for x
    x = 9,680.94/85.16
  6. Step 6: Final answer
    x = 113.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.