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Finding the Fourth Proportional to 69.72, 95.52 and 64.86

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Solution

The fourth proportional to 69.72, 95.52 and 64.86 is: 88.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.72 : 95.52 = 64.86 : x
  2. Step 2: Convert to fraction form
    69.72/95.52 = 64.86/x
  3. Step 3: Cross multiply
    69.72x = 95.52 × 64.86
  4. Step 4: Simplify right side
    69.72x = 6,195.43
  5. Step 5: Solve for x
    x = 6,195.43/69.72
  6. Step 6: Final answer
    x = 88.86

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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.