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Finding the Fourth Proportional to 387.10, 581.32 and 225.80

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Solution

The fourth proportional to 387.10, 581.32 and 225.80 is: 339.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 581.32 = 225.80 : x
  2. Step 2: Convert to fraction form
    387.10/581.32 = 225.80/x
  3. Step 3: Cross multiply
    387.10x = 581.32 × 225.80
  4. Step 4: Simplify right side
    387.10x = 131,262.06
  5. Step 5: Solve for x
    x = 131,262.06/387.10
  6. Step 6: Final answer
    x = 339.09

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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.