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Finding the Fourth Proportional to 687.42, 1,031.02 and 254.48

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Solution

The fourth proportional to 687.42, 1,031.02 and 254.48 is: 381.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.42 : 1,031.02 = 254.48 : x
  2. Step 2: Convert to fraction form
    687.42/1,031.02 = 254.48/x
  3. Step 3: Cross multiply
    687.42x = 1,031.02 × 254.48
  4. Step 4: Simplify right side
    687.42x = 262,367.54
  5. Step 5: Solve for x
    x = 262,367.54/687.42
  6. Step 6: Final answer
    x = 381.67

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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.