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Finding the Fourth Proportional to 462.30, 691.85 and 286.53

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Solution

The fourth proportional to 462.30, 691.85 and 286.53 is: 428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.30 : 691.85 = 286.53 : x
  2. Step 2: Convert to fraction form
    462.30/691.85 = 286.53/x
  3. Step 3: Cross multiply
    462.30x = 691.85 × 286.53
  4. Step 4: Simplify right side
    462.30x = 198,234.35
  5. Step 5: Solve for x
    x = 198,234.35/462.30
  6. Step 6: Final answer
    x = 428.80

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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.