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Finding the Fourth Proportional to 581.09, 871.56 and 215.78

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Solution

The fourth proportional to 581.09, 871.56 and 215.78 is: 323.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.09 : 871.56 = 215.78 : x
  2. Step 2: Convert to fraction form
    581.09/871.56 = 215.78/x
  3. Step 3: Cross multiply
    581.09x = 871.56 × 215.78
  4. Step 4: Simplify right side
    581.09x = 188,062.22
  5. Step 5: Solve for x
    x = 188,062.22/581.09
  6. Step 6: Final answer
    x = 323.64

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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.