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Finding the Fourth Proportional to 69.23, 95.78 and 66.71

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Solution

The fourth proportional to 69.23, 95.78 and 66.71 is: 92.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.23 : 95.78 = 66.71 : x
  2. Step 2: Convert to fraction form
    69.23/95.78 = 66.71/x
  3. Step 3: Cross multiply
    69.23x = 95.78 × 66.71
  4. Step 4: Simplify right side
    69.23x = 6,389.89
  5. Step 5: Solve for x
    x = 6,389.89/69.23
  6. Step 6: Final answer
    x = 92.30

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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.