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Finding the Fourth Proportional to 86.11, 118.74 and 79.63

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Solution

The fourth proportional to 86.11, 118.74 and 79.63 is: 109.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.11 : 118.74 = 79.63 : x
  2. Step 2: Convert to fraction form
    86.11/118.74 = 79.63/x
  3. Step 3: Cross multiply
    86.11x = 118.74 × 79.63
  4. Step 4: Simplify right side
    86.11x = 9,455.27
  5. Step 5: Solve for x
    x = 9,455.27/86.11
  6. Step 6: Final answer
    x = 109.80

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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.