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Finding the Fourth Proportional to 687.53, 1,031.04 and 225.22

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Solution

The fourth proportional to 687.53, 1,031.04 and 225.22 is: 337.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.53 : 1,031.04 = 225.22 : x
  2. Step 2: Convert to fraction form
    687.53/1,031.04 = 225.22/x
  3. Step 3: Cross multiply
    687.53x = 1,031.04 × 225.22
  4. Step 4: Simplify right side
    687.53x = 232,210.83
  5. Step 5: Solve for x
    x = 232,210.83/687.53
  6. Step 6: Final answer
    x = 337.75

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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.