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Finding the Fourth Proportional to 687.63, 1,031.44 and 231.63

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Solution

The fourth proportional to 687.63, 1,031.44 and 231.63 is: 347.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.63 : 1,031.44 = 231.63 : x
  2. Step 2: Convert to fraction form
    687.63/1,031.44 = 231.63/x
  3. Step 3: Cross multiply
    687.63x = 1,031.44 × 231.63
  4. Step 4: Simplify right side
    687.63x = 238,912.45
  5. Step 5: Solve for x
    x = 238,912.45/687.63
  6. Step 6: Final answer
    x = 347.44

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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.