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Finding the Fourth Proportional to 118.71, 163.76 and 79.31

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Solution

The fourth proportional to 118.71, 163.76 and 79.31 is: 109.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.71 : 163.76 = 79.31 : x
  2. Step 2: Convert to fraction form
    118.71/163.76 = 79.31/x
  3. Step 3: Cross multiply
    118.71x = 163.76 × 79.31
  4. Step 4: Simplify right side
    118.71x = 12,987.81
  5. Step 5: Solve for x
    x = 12,987.81/118.71
  6. Step 6: Final answer
    x = 109.41

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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.