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Finding the Fourth Proportional to 576.74, 865.41 and 440.61

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Solution

The fourth proportional to 576.74, 865.41 and 440.61 is: 661.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.74 : 865.41 = 440.61 : x
  2. Step 2: Convert to fraction form
    576.74/865.41 = 440.61/x
  3. Step 3: Cross multiply
    576.74x = 865.41 × 440.61
  4. Step 4: Simplify right side
    576.74x = 381,308.30
  5. Step 5: Solve for x
    x = 381,308.30/576.74
  6. Step 6: Final answer
    x = 661.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.