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Finding the Fourth Proportional to 581.18, 871.50 and 215.87

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Solution

The fourth proportional to 581.18, 871.50 and 215.87 is: 323.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.18 : 871.50 = 215.87 : x
  2. Step 2: Convert to fraction form
    581.18/871.50 = 215.87/x
  3. Step 3: Cross multiply
    581.18x = 871.50 × 215.87
  4. Step 4: Simplify right side
    581.18x = 188,126.35
  5. Step 5: Solve for x
    x = 188,126.35/581.18
  6. Step 6: Final answer
    x = 323.70

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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.