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Finding the Fourth Proportional to 257.32, 385.89 and 74.67

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Solution

The fourth proportional to 257.32, 385.89 and 74.67 is: 111.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.32 : 385.89 = 74.67 : x
  2. Step 2: Convert to fraction form
    257.32/385.89 = 74.67/x
  3. Step 3: Cross multiply
    257.32x = 385.89 × 74.67
  4. Step 4: Simplify right side
    257.32x = 28,814.41
  5. Step 5: Solve for x
    x = 28,814.41/257.32
  6. Step 6: Final answer
    x = 111.98

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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.