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Finding the Fourth Proportional to 687.24, 1,031.40 and 504.90

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Solution

The fourth proportional to 687.24, 1,031.40 and 504.90 is: 757.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.24 : 1,031.40 = 504.90 : x
  2. Step 2: Convert to fraction form
    687.24/1,031.40 = 504.90/x
  3. Step 3: Cross multiply
    687.24x = 1,031.40 × 504.90
  4. Step 4: Simplify right side
    687.24x = 520,753.86
  5. Step 5: Solve for x
    x = 520,753.86/687.24
  6. Step 6: Final answer
    x = 757.75

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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.