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Finding the Fourth Proportional to 79.86, 110.17 and 47.11

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Solution

The fourth proportional to 79.86, 110.17 and 47.11 is: 64.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.86 : 110.17 = 47.11 : x
  2. Step 2: Convert to fraction form
    79.86/110.17 = 47.11/x
  3. Step 3: Cross multiply
    79.86x = 110.17 × 47.11
  4. Step 4: Simplify right side
    79.86x = 5,190.11
  5. Step 5: Solve for x
    x = 5,190.11/79.86
  6. Step 6: Final answer
    x = 64.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.