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Finding the Fourth Proportional to 688.22, 1,031.99 and 225.99

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Solution

The fourth proportional to 688.22, 1,031.99 and 225.99 is: 338.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.22 : 1,031.99 = 225.99 : x
  2. Step 2: Convert to fraction form
    688.22/1,031.99 = 225.99/x
  3. Step 3: Cross multiply
    688.22x = 1,031.99 × 225.99
  4. Step 4: Simplify right side
    688.22x = 233,219.56
  5. Step 5: Solve for x
    x = 233,219.56/688.22
  6. Step 6: Final answer
    x = 338.87

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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.