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Finding the Fourth Proportional to 1,031.45, 1,422.29 and 681.53

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Solution

The fourth proportional to 1,031.45, 1,422.29 and 681.53 is: 939.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.45 : 1,422.29 = 681.53 : x
  2. Step 2: Convert to fraction form
    1,031.45/1,422.29 = 681.53/x
  3. Step 3: Cross multiply
    1,031.45x = 1,422.29 × 681.53
  4. Step 4: Simplify right side
    1,031.45x = 969,327.90
  5. Step 5: Solve for x
    x = 969,327.90/1,031.45
  6. Step 6: Final answer
    x = 939.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.