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Finding the Fourth Proportional to 79.15, 118.66 and 35.81

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Solution

The fourth proportional to 79.15, 118.66 and 35.81 is: 53.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.15 : 118.66 = 35.81 : x
  2. Step 2: Convert to fraction form
    79.15/118.66 = 35.81/x
  3. Step 3: Cross multiply
    79.15x = 118.66 × 35.81
  4. Step 4: Simplify right side
    79.15x = 4,249.21
  5. Step 5: Solve for x
    x = 4,249.21/79.15
  6. Step 6: Final answer
    x = 53.69

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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.