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Finding the Fourth Proportional to 285.28, 428.12 and 140.92

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Solution

The fourth proportional to 285.28, 428.12 and 140.92 is: 211.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.28 : 428.12 = 140.92 : x
  2. Step 2: Convert to fraction form
    285.28/428.12 = 140.92/x
  3. Step 3: Cross multiply
    285.28x = 428.12 × 140.92
  4. Step 4: Simplify right side
    285.28x = 60,330.67
  5. Step 5: Solve for x
    x = 60,330.67/285.28
  6. Step 6: Final answer
    x = 211.48

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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.