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Finding the Fourth Proportional to 387.35, 581.12 and 213.99

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Solution

The fourth proportional to 387.35, 581.12 and 213.99 is: 321.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.35 : 581.12 = 213.99 : x
  2. Step 2: Convert to fraction form
    387.35/581.12 = 213.99/x
  3. Step 3: Cross multiply
    387.35x = 581.12 × 213.99
  4. Step 4: Simplify right side
    387.35x = 124,353.87
  5. Step 5: Solve for x
    x = 124,353.87/387.35
  6. Step 6: Final answer
    x = 321.04

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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.