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Finding the Fourth Proportional to 91.65, 126.34 and 69.78

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Solution

The fourth proportional to 91.65, 126.34 and 69.78 is: 96.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.65 : 126.34 = 69.78 : x
  2. Step 2: Convert to fraction form
    91.65/126.34 = 69.78/x
  3. Step 3: Cross multiply
    91.65x = 126.34 × 69.78
  4. Step 4: Simplify right side
    91.65x = 8,816.01
  5. Step 5: Solve for x
    x = 8,816.01/91.65
  6. Step 6: Final answer
    x = 96.19

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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.