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Finding the Fourth Proportional to 749.68, 1,034.16 and 439.12

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Solution

The fourth proportional to 749.68, 1,034.16 and 439.12 is: 605.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.68 : 1,034.16 = 439.12 : x
  2. Step 2: Convert to fraction form
    749.68/1,034.16 = 439.12/x
  3. Step 3: Cross multiply
    749.68x = 1,034.16 × 439.12
  4. Step 4: Simplify right side
    749.68x = 454,120.34
  5. Step 5: Solve for x
    x = 454,120.34/749.68
  6. Step 6: Final answer
    x = 605.75

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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.