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Finding the Fourth Proportional to 69.28, 95.57 and 47.47

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Solution

The fourth proportional to 69.28, 95.57 and 47.47 is: 65.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.28 : 95.57 = 47.47 : x
  2. Step 2: Convert to fraction form
    69.28/95.57 = 47.47/x
  3. Step 3: Cross multiply
    69.28x = 95.57 × 47.47
  4. Step 4: Simplify right side
    69.28x = 4,536.41
  5. Step 5: Solve for x
    x = 4,536.41/69.28
  6. Step 6: Final answer
    x = 65.48

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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.