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Finding the Fourth Proportional to 687.89, 1,031.72 and 276.92

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Solution

The fourth proportional to 687.89, 1,031.72 and 276.92 is: 415.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.89 : 1,031.72 = 276.92 : x
  2. Step 2: Convert to fraction form
    687.89/1,031.72 = 276.92/x
  3. Step 3: Cross multiply
    687.89x = 1,031.72 × 276.92
  4. Step 4: Simplify right side
    687.89x = 285,703.90
  5. Step 5: Solve for x
    x = 285,703.90/687.89
  6. Step 6: Final answer
    x = 415.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.