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Finding the Fourth Proportional to 257.16, 385.76 and 74.55

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Solution

The fourth proportional to 257.16, 385.76 and 74.55 is: 111.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.16 : 385.76 = 74.55 : x
  2. Step 2: Convert to fraction form
    257.16/385.76 = 74.55/x
  3. Step 3: Cross multiply
    257.16x = 385.76 × 74.55
  4. Step 4: Simplify right side
    257.16x = 28,758.41
  5. Step 5: Solve for x
    x = 28,758.41/257.16
  6. Step 6: Final answer
    x = 111.83

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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.