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Finding the Fourth Proportional to 67.67, 92.77 and 66.45

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Solution

The fourth proportional to 67.67, 92.77 and 66.45 is: 91.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.67 : 92.77 = 66.45 : x
  2. Step 2: Convert to fraction form
    67.67/92.77 = 66.45/x
  3. Step 3: Cross multiply
    67.67x = 92.77 × 66.45
  4. Step 4: Simplify right side
    67.67x = 6,164.57
  5. Step 5: Solve for x
    x = 6,164.57/67.67
  6. Step 6: Final answer
    x = 91.10

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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.