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Finding the Fourth Proportional to 215.98, 324.15 and 143.89

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Solution

The fourth proportional to 215.98, 324.15 and 143.89 is: 215.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.98 : 324.15 = 143.89 : x
  2. Step 2: Convert to fraction form
    215.98/324.15 = 143.89/x
  3. Step 3: Cross multiply
    215.98x = 324.15 × 143.89
  4. Step 4: Simplify right side
    215.98x = 46,641.94
  5. Step 5: Solve for x
    x = 46,641.94/215.98
  6. Step 6: Final answer
    x = 215.95

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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.