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Finding the Fourth Proportional to 257.56, 386.12 and 113.20

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Solution

The fourth proportional to 257.56, 386.12 and 113.20 is: 169.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.56 : 386.12 = 113.20 : x
  2. Step 2: Convert to fraction form
    257.56/386.12 = 113.20/x
  3. Step 3: Cross multiply
    257.56x = 386.12 × 113.20
  4. Step 4: Simplify right side
    257.56x = 43,708.78
  5. Step 5: Solve for x
    x = 43,708.78/257.56
  6. Step 6: Final answer
    x = 169.70

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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.