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Finding the Fourth Proportional to 581.11, 871.43 and 215.66

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Solution

The fourth proportional to 581.11, 871.43 and 215.66 is: 323.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.11 : 871.43 = 215.66 : x
  2. Step 2: Convert to fraction form
    581.11/871.43 = 215.66/x
  3. Step 3: Cross multiply
    581.11x = 871.43 × 215.66
  4. Step 4: Simplify right side
    581.11x = 187,933.69
  5. Step 5: Solve for x
    x = 187,933.69/581.11
  6. Step 6: Final answer
    x = 323.41

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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.