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Finding the Fourth Proportional to 497.69, 686.76 and 276.61

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Solution

The fourth proportional to 497.69, 686.76 and 276.61 is: 381.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.69 : 686.76 = 276.61 : x
  2. Step 2: Convert to fraction form
    497.69/686.76 = 276.61/x
  3. Step 3: Cross multiply
    497.69x = 686.76 × 276.61
  4. Step 4: Simplify right side
    497.69x = 189,961.25
  5. Step 5: Solve for x
    x = 189,961.25/497.69
  6. Step 6: Final answer
    x = 381.69

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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.