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Finding the Fourth Proportional to 69.33, 95.72 and 64.47

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Solution

The fourth proportional to 69.33, 95.72 and 64.47 is: 89.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.33 : 95.72 = 64.47 : x
  2. Step 2: Convert to fraction form
    69.33/95.72 = 64.47/x
  3. Step 3: Cross multiply
    69.33x = 95.72 × 64.47
  4. Step 4: Simplify right side
    69.33x = 6,170.75
  5. Step 5: Solve for x
    x = 6,170.75/69.33
  6. Step 6: Final answer
    x = 89.01

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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.