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Finding the Fourth Proportional to 387.44, 581.09 and 143.94

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Solution

The fourth proportional to 387.44, 581.09 and 143.94 is: 215.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.44 : 581.09 = 143.94 : x
  2. Step 2: Convert to fraction form
    387.44/581.09 = 143.94/x
  3. Step 3: Cross multiply
    387.44x = 581.09 × 143.94
  4. Step 4: Simplify right side
    387.44x = 83,641.37
  5. Step 5: Solve for x
    x = 83,641.37/387.44
  6. Step 6: Final answer
    x = 215.88

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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.