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Finding the Fourth Proportional to 215.98, 324.04 and 71.72

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Solution

The fourth proportional to 215.98, 324.04 and 71.72 is: 107.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.98 : 324.04 = 71.72 : x
  2. Step 2: Convert to fraction form
    215.98/324.04 = 71.72/x
  3. Step 3: Cross multiply
    215.98x = 324.04 × 71.72
  4. Step 4: Simplify right side
    215.98x = 23,240.15
  5. Step 5: Solve for x
    x = 23,240.15/215.98
  6. Step 6: Final answer
    x = 107.60

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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.