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Finding the Fourth Proportional to 69.19, 95.36 and 57.47

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Solution

The fourth proportional to 69.19, 95.36 and 57.47 is: 79.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.19 : 95.36 = 57.47 : x
  2. Step 2: Convert to fraction form
    69.19/95.36 = 57.47/x
  3. Step 3: Cross multiply
    69.19x = 95.36 × 57.47
  4. Step 4: Simplify right side
    69.19x = 5,480.29
  5. Step 5: Solve for x
    x = 5,480.29/69.19
  6. Step 6: Final answer
    x = 79.21

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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.