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Finding the Fourth Proportional to 387.68, 581.76 and 225.52

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Solution

The fourth proportional to 387.68, 581.76 and 225.52 is: 338.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.68 : 581.76 = 225.52 : x
  2. Step 2: Convert to fraction form
    387.68/581.76 = 225.52/x
  3. Step 3: Cross multiply
    387.68x = 581.76 × 225.52
  4. Step 4: Simplify right side
    387.68x = 131,198.52
  5. Step 5: Solve for x
    x = 131,198.52/387.68
  6. Step 6: Final answer
    x = 338.42

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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.