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Finding the Fourth Proportional to 130.28, 195.46 and 57.15

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Solution

The fourth proportional to 130.28, 195.46 and 57.15 is: 85.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.28 : 195.46 = 57.15 : x
  2. Step 2: Convert to fraction form
    130.28/195.46 = 57.15/x
  3. Step 3: Cross multiply
    130.28x = 195.46 × 57.15
  4. Step 4: Simplify right side
    130.28x = 11,170.54
  5. Step 5: Solve for x
    x = 11,170.54/130.28
  6. Step 6: Final answer
    x = 85.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.