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Finding the Fourth Proportional to 91.81, 126.69 and 66.93

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Solution

The fourth proportional to 91.81, 126.69 and 66.93 is: 92.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.81 : 126.69 = 66.93 : x
  2. Step 2: Convert to fraction form
    91.81/126.69 = 66.93/x
  3. Step 3: Cross multiply
    91.81x = 126.69 × 66.93
  4. Step 4: Simplify right side
    91.81x = 8,479.36
  5. Step 5: Solve for x
    x = 8,479.36/91.81
  6. Step 6: Final answer
    x = 92.36

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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.