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Finding the Fourth Proportional to 445.76, 667.11 and 281.15

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Solution

The fourth proportional to 445.76, 667.11 and 281.15 is: 420.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.76 : 667.11 = 281.15 : x
  2. Step 2: Convert to fraction form
    445.76/667.11 = 281.15/x
  3. Step 3: Cross multiply
    445.76x = 667.11 × 281.15
  4. Step 4: Simplify right side
    445.76x = 187,561.16
  5. Step 5: Solve for x
    x = 187,561.16/445.76
  6. Step 6: Final answer
    x = 420.77

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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.