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Finding the Fourth Proportional to 257.57, 386.31 and 74.92

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Solution

The fourth proportional to 257.57, 386.31 and 74.92 is: 112.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.57 : 386.31 = 74.92 : x
  2. Step 2: Convert to fraction form
    257.57/386.31 = 74.92/x
  3. Step 3: Cross multiply
    257.57x = 386.31 × 74.92
  4. Step 4: Simplify right side
    257.57x = 28,943.12
  5. Step 5: Solve for x
    x = 28,943.12/257.57
  6. Step 6: Final answer
    x = 112.37

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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.