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Finding the Fourth Proportional to 67.20, 92.16 and 66.60

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Solution

The fourth proportional to 67.20, 92.16 and 66.60 is: 91.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.20 : 92.16 = 66.60 : x
  2. Step 2: Convert to fraction form
    67.20/92.16 = 66.60/x
  3. Step 3: Cross multiply
    67.20x = 92.16 × 66.60
  4. Step 4: Simplify right side
    67.20x = 6,137.86
  5. Step 5: Solve for x
    x = 6,137.86/67.20
  6. Step 6: Final answer
    x = 91.34

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.