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Finding the Fourth Proportional to 387.87, 581.61 and 141.07

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Solution

The fourth proportional to 387.87, 581.61 and 141.07 is: 211.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.87 : 581.61 = 141.07 : x
  2. Step 2: Convert to fraction form
    387.87/581.61 = 141.07/x
  3. Step 3: Cross multiply
    387.87x = 581.61 × 141.07
  4. Step 4: Simplify right side
    387.87x = 82,046.80
  5. Step 5: Solve for x
    x = 82,046.80/387.87
  6. Step 6: Final answer
    x = 211.53

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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.