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Finding the Fourth Proportional to 257.41, 386.17 and 74.80

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Solution

The fourth proportional to 257.41, 386.17 and 74.80 is: 112.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.41 : 386.17 = 74.80 : x
  2. Step 2: Convert to fraction form
    257.41/386.17 = 74.80/x
  3. Step 3: Cross multiply
    257.41x = 386.17 × 74.80
  4. Step 4: Simplify right side
    257.41x = 28,885.52
  5. Step 5: Solve for x
    x = 28,885.52/257.41
  6. Step 6: Final answer
    x = 112.22

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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.