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Finding the Fourth Proportional to 67.20, 91.44 and 66.84

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Solution

The fourth proportional to 67.20, 91.44 and 66.84 is: 90.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.20 : 91.44 = 66.84 : x
  2. Step 2: Convert to fraction form
    67.20/91.44 = 66.84/x
  3. Step 3: Cross multiply
    67.20x = 91.44 × 66.84
  4. Step 4: Simplify right side
    67.20x = 6,111.85
  5. Step 5: Solve for x
    x = 6,111.85/67.20
  6. Step 6: Final answer
    x = 90.95

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.