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Finding the Fourth Proportional to 749.75, 1,034.72 and 439.31

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Solution

The fourth proportional to 749.75, 1,034.72 and 439.31 is: 606.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.75 : 1,034.72 = 439.31 : x
  2. Step 2: Convert to fraction form
    749.75/1,034.72 = 439.31/x
  3. Step 3: Cross multiply
    749.75x = 1,034.72 × 439.31
  4. Step 4: Simplify right side
    749.75x = 454,562.84
  5. Step 5: Solve for x
    x = 454,562.84/749.75
  6. Step 6: Final answer
    x = 606.29

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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.