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Finding the Fourth Proportional to 79.68, 118.81 and 72.38

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Solution

The fourth proportional to 79.68, 118.81 and 72.38 is: 107.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.68 : 118.81 = 72.38 : x
  2. Step 2: Convert to fraction form
    79.68/118.81 = 72.38/x
  3. Step 3: Cross multiply
    79.68x = 118.81 × 72.38
  4. Step 4: Simplify right side
    79.68x = 8,599.47
  5. Step 5: Solve for x
    x = 8,599.47/79.68
  6. Step 6: Final answer
    x = 107.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.