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Finding the Fourth Proportional to 581.15, 871.63 and 215.91

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Solution

The fourth proportional to 581.15, 871.63 and 215.91 is: 323.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.15 : 871.63 = 215.91 : x
  2. Step 2: Convert to fraction form
    581.15/871.63 = 215.91/x
  3. Step 3: Cross multiply
    581.15x = 871.63 × 215.91
  4. Step 4: Simplify right side
    581.15x = 188,193.09
  5. Step 5: Solve for x
    x = 188,193.09/581.15
  6. Step 6: Final answer
    x = 323.83

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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.