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Finding the Fourth Proportional to 497.60, 686.70 and 276.56

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Solution

The fourth proportional to 497.60, 686.70 and 276.56 is: 381.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.60 : 686.70 = 276.56 : x
  2. Step 2: Convert to fraction form
    497.60/686.70 = 276.56/x
  3. Step 3: Cross multiply
    497.60x = 686.70 × 276.56
  4. Step 4: Simplify right side
    497.60x = 189,913.75
  5. Step 5: Solve for x
    x = 189,913.75/497.60
  6. Step 6: Final answer
    x = 381.66

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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.