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Finding the Fourth Proportional to 581.18, 871.89 and 191.21

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Solution

The fourth proportional to 581.18, 871.89 and 191.21 is: 286.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.18 : 871.89 = 191.21 : x
  2. Step 2: Convert to fraction form
    581.18/871.89 = 191.21/x
  3. Step 3: Cross multiply
    581.18x = 871.89 × 191.21
  4. Step 4: Simplify right side
    581.18x = 166,714.09
  5. Step 5: Solve for x
    x = 166,714.09/581.18
  6. Step 6: Final answer
    x = 286.85

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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.