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Finding the Fourth Proportional to 1,034.42, 1,427.70 and 679.72

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Solution

The fourth proportional to 1,034.42, 1,427.70 and 679.72 is: 938.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.42 : 1,427.70 = 679.72 : x
  2. Step 2: Convert to fraction form
    1,034.42/1,427.70 = 679.72/x
  3. Step 3: Cross multiply
    1,034.42x = 1,427.70 × 679.72
  4. Step 4: Simplify right side
    1,034.42x = 970,431.97
  5. Step 5: Solve for x
    x = 970,431.97/1,034.42
  6. Step 6: Final answer
    x = 938.14

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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.