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Finding the Fourth Proportional to 578.79, 865.92 and 447.79

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Solution

The fourth proportional to 578.79, 865.92 and 447.79 is: 669.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.79 : 865.92 = 447.79 : x
  2. Step 2: Convert to fraction form
    578.79/865.92 = 447.79/x
  3. Step 3: Cross multiply
    578.79x = 865.92 × 447.79
  4. Step 4: Simplify right side
    578.79x = 387,750.32
  5. Step 5: Solve for x
    x = 387,750.32/578.79
  6. Step 6: Final answer
    x = 669.93

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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.