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Finding the Fourth Proportional to 387.94, 581.13 and 225.70

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Solution

The fourth proportional to 387.94, 581.13 and 225.70 is: 338.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.94 : 581.13 = 225.70 : x
  2. Step 2: Convert to fraction form
    387.94/581.13 = 225.70/x
  3. Step 3: Cross multiply
    387.94x = 581.13 × 225.70
  4. Step 4: Simplify right side
    387.94x = 131,161.04
  5. Step 5: Solve for x
    x = 131,161.04/387.94
  6. Step 6: Final answer
    x = 338.10

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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.