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Finding the Fourth Proportional to 143.87, 215.83 and 57.21

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Solution

The fourth proportional to 143.87, 215.83 and 57.21 is: 85.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.87 : 215.83 = 57.21 : x
  2. Step 2: Convert to fraction form
    143.87/215.83 = 57.21/x
  3. Step 3: Cross multiply
    143.87x = 215.83 × 57.21
  4. Step 4: Simplify right side
    143.87x = 12,348.30
  5. Step 5: Solve for x
    x = 12,348.30/143.87
  6. Step 6: Final answer
    x = 85.83

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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.