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Finding the Fourth Proportional to 387.87, 581.42 and 168.63

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Solution

The fourth proportional to 387.87, 581.42 and 168.63 is: 252.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.87 : 581.42 = 168.63 : x
  2. Step 2: Convert to fraction form
    387.87/581.42 = 168.63/x
  3. Step 3: Cross multiply
    387.87x = 581.42 × 168.63
  4. Step 4: Simplify right side
    387.87x = 98,044.01
  5. Step 5: Solve for x
    x = 98,044.01/387.87
  6. Step 6: Final answer
    x = 252.78

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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.