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Finding the Fourth Proportional to 72.79, 109.16 and 27.14

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Solution

The fourth proportional to 72.79, 109.16 and 27.14 is: 40.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.79 : 109.16 = 27.14 : x
  2. Step 2: Convert to fraction form
    72.79/109.16 = 27.14/x
  3. Step 3: Cross multiply
    72.79x = 109.16 × 27.14
  4. Step 4: Simplify right side
    72.79x = 2,961.92
  5. Step 5: Solve for x
    x = 2,961.92/72.79
  6. Step 6: Final answer
    x = 40.69

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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.