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Finding the Fourth Proportional to 72, 107.88 and 31.44

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Solution

The fourth proportional to 72, 107.88 and 31.44 is: 47.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    72 : 107.88 = 31.44 : x
  2. Step 2: Convert to fraction form
    72/107.88 = 31.44/x
  3. Step 3: Cross multiply
    72x = 107.88 × 31.44
  4. Step 4: Simplify right side
    72x = 3,391.75
  5. Step 5: Solve for x
    x = 3,391.75/72
  6. Step 6: Final answer
    x = 47.11

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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.