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Finding the Fourth Proportional to 439.78, 660.08 and 223.51

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Solution

The fourth proportional to 439.78, 660.08 and 223.51 is: 335.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.78 : 660.08 = 223.51 : x
  2. Step 2: Convert to fraction form
    439.78/660.08 = 223.51/x
  3. Step 3: Cross multiply
    439.78x = 660.08 × 223.51
  4. Step 4: Simplify right side
    439.78x = 147,531.71
  5. Step 5: Solve for x
    x = 147,531.71/439.78
  6. Step 6: Final answer
    x = 335.47

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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.