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Finding the Fourth Proportional to 69.14, 103.20 and 57.75

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Solution

The fourth proportional to 69.14, 103.20 and 57.75 is: 86.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.14 : 103.20 = 57.75 : x
  2. Step 2: Convert to fraction form
    69.14/103.20 = 57.75/x
  3. Step 3: Cross multiply
    69.14x = 103.20 × 57.75
  4. Step 4: Simplify right side
    69.14x = 5,959.80
  5. Step 5: Solve for x
    x = 5,959.80/69.14
  6. Step 6: Final answer
    x = 86.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.