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Finding the Fourth Proportional to 497.68, 686.78 and 276.64

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Solution

The fourth proportional to 497.68, 686.78 and 276.64 is: 381.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.68 : 686.78 = 276.64 : x
  2. Step 2: Convert to fraction form
    497.68/686.78 = 276.64/x
  3. Step 3: Cross multiply
    497.68x = 686.78 × 276.64
  4. Step 4: Simplify right side
    497.68x = 189,990.82
  5. Step 5: Solve for x
    x = 189,990.82/497.68
  6. Step 6: Final answer
    x = 381.75

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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.