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Finding the Fourth Proportional to 72.82, 109.12 and 47.17

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Solution

The fourth proportional to 72.82, 109.12 and 47.17 is: 70.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.82 : 109.12 = 47.17 : x
  2. Step 2: Convert to fraction form
    72.82/109.12 = 47.17/x
  3. Step 3: Cross multiply
    72.82x = 109.12 × 47.17
  4. Step 4: Simplify right side
    72.82x = 5,147.19
  5. Step 5: Solve for x
    x = 5,147.19/72.82
  6. Step 6: Final answer
    x = 70.68

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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.