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Finding the Fourth Proportional to 387.34, 581.11 and 113.43

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Solution

The fourth proportional to 387.34, 581.11 and 113.43 is: 170.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.34 : 581.11 = 113.43 : x
  2. Step 2: Convert to fraction form
    387.34/581.11 = 113.43/x
  3. Step 3: Cross multiply
    387.34x = 581.11 × 113.43
  4. Step 4: Simplify right side
    387.34x = 65,917.20
  5. Step 5: Solve for x
    x = 65,917.20/387.34
  6. Step 6: Final answer
    x = 170.18

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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.