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Finding the Fourth Proportional to 67.13, 92.70 and 66.68

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Solution

The fourth proportional to 67.13, 92.70 and 66.68 is: 92.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.13 : 92.70 = 66.68 : x
  2. Step 2: Convert to fraction form
    67.13/92.70 = 66.68/x
  3. Step 3: Cross multiply
    67.13x = 92.70 × 66.68
  4. Step 4: Simplify right side
    67.13x = 6,180.77
  5. Step 5: Solve for x
    x = 6,180.77/67.13
  6. Step 6: Final answer
    x = 92.08

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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.