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Finding the Fourth Proportional to 439.50, 661.71 and 388.44

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Solution

The fourth proportional to 439.50, 661.71 and 388.44 is: 584.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.50 : 661.71 = 388.44 : x
  2. Step 2: Convert to fraction form
    439.50/661.71 = 388.44/x
  3. Step 3: Cross multiply
    439.50x = 661.71 × 388.44
  4. Step 4: Simplify right side
    439.50x = 257,034.63
  5. Step 5: Solve for x
    x = 257,034.63/439.50
  6. Step 6: Final answer
    x = 584.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.