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Finding the Fourth Proportional to 497.72, 686.79 and 276.65

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Solution

The fourth proportional to 497.72, 686.79 and 276.65 is: 381.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.72 : 686.79 = 276.65 : x
  2. Step 2: Convert to fraction form
    497.72/686.79 = 276.65/x
  3. Step 3: Cross multiply
    497.72x = 686.79 × 276.65
  4. Step 4: Simplify right side
    497.72x = 189,997.02
  5. Step 5: Solve for x
    x = 189,997.02/497.72
  6. Step 6: Final answer
    x = 381.73

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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.