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Finding the Fourth Proportional to 578.05, 867.51 and 439.65

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Solution

The fourth proportional to 578.05, 867.51 and 439.65 is: 659.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.05 : 867.51 = 439.65 : x
  2. Step 2: Convert to fraction form
    578.05/867.51 = 439.65/x
  3. Step 3: Cross multiply
    578.05x = 867.51 × 439.65
  4. Step 4: Simplify right side
    578.05x = 381,400.47
  5. Step 5: Solve for x
    x = 381,400.47/578.05
  6. Step 6: Final answer
    x = 659.81

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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.