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Finding the Fourth Proportional to 687.03, 1,031.05 and 427.41

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Solution

The fourth proportional to 687.03, 1,031.05 and 427.41 is: 641.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.03 : 1,031.05 = 427.41 : x
  2. Step 2: Convert to fraction form
    687.03/1,031.05 = 427.41/x
  3. Step 3: Cross multiply
    687.03x = 1,031.05 × 427.41
  4. Step 4: Simplify right side
    687.03x = 440,687.17
  5. Step 5: Solve for x
    x = 440,687.17/687.03
  6. Step 6: Final answer
    x = 641.44

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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.