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Finding the Fourth Proportional to 342.62, 515.02 and 285.20

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Solution

The fourth proportional to 342.62, 515.02 and 285.20 is: 428.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.62 : 515.02 = 285.20 : x
  2. Step 2: Convert to fraction form
    342.62/515.02 = 285.20/x
  3. Step 3: Cross multiply
    342.62x = 515.02 × 285.20
  4. Step 4: Simplify right side
    342.62x = 146,883.70
  5. Step 5: Solve for x
    x = 146,883.70/342.62
  6. Step 6: Final answer
    x = 428.71

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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.