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Finding the Fourth Proportional to 85.17, 127.67 and 80.67

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Solution

The fourth proportional to 85.17, 127.67 and 80.67 is: 120.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.17 : 127.67 = 80.67 : x
  2. Step 2: Convert to fraction form
    85.17/127.67 = 80.67/x
  3. Step 3: Cross multiply
    85.17x = 127.67 × 80.67
  4. Step 4: Simplify right side
    85.17x = 10,298.74
  5. Step 5: Solve for x
    x = 10,298.74/85.17
  6. Step 6: Final answer
    x = 120.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.