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Finding the Fourth Proportional to 85.76, 118.28 and 67.30

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Solution

The fourth proportional to 85.76, 118.28 and 67.30 is: 92.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.76 : 118.28 = 67.30 : x
  2. Step 2: Convert to fraction form
    85.76/118.28 = 67.30/x
  3. Step 3: Cross multiply
    85.76x = 118.28 × 67.30
  4. Step 4: Simplify right side
    85.76x = 7,960.24
  5. Step 5: Solve for x
    x = 7,960.24/85.76
  6. Step 6: Final answer
    x = 92.82

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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.