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Finding the Fourth Proportional to 497.61, 686.72 and 276.55

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Solution

The fourth proportional to 497.61, 686.72 and 276.55 is: 381.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.61 : 686.72 = 276.55 : x
  2. Step 2: Convert to fraction form
    497.61/686.72 = 276.55/x
  3. Step 3: Cross multiply
    497.61x = 686.72 × 276.55
  4. Step 4: Simplify right side
    497.61x = 189,912.42
  5. Step 5: Solve for x
    x = 189,912.42/497.61
  6. Step 6: Final answer
    x = 381.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.