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Finding the Fourth Proportional to 257, 385.52 and 112.76

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Solution

The fourth proportional to 257, 385.52 and 112.76 is: 169.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    257 : 385.52 = 112.76 : x
  2. Step 2: Convert to fraction form
    257/385.52 = 112.76/x
  3. Step 3: Cross multiply
    257x = 385.52 × 112.76
  4. Step 4: Simplify right side
    257x = 43,471.24
  5. Step 5: Solve for x
    x = 43,471.24/257
  6. Step 6: Final answer
    x = 169.15

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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.