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Finding the Fourth Proportional to 734.43, 1,013.65 and 439.64

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Solution

The fourth proportional to 734.43, 1,013.65 and 439.64 is: 606.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.43 : 1,013.65 = 439.64 : x
  2. Step 2: Convert to fraction form
    734.43/1,013.65 = 439.64/x
  3. Step 3: Cross multiply
    734.43x = 1,013.65 × 439.64
  4. Step 4: Simplify right side
    734.43x = 445,634.92
  5. Step 5: Solve for x
    x = 445,634.92/734.43
  6. Step 6: Final answer
    x = 606.78

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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.