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Finding the Fourth Proportional to 79.32, 118.90 and 31.26

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Solution

The fourth proportional to 79.32, 118.90 and 31.26 is: 46.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.32 : 118.90 = 31.26 : x
  2. Step 2: Convert to fraction form
    79.32/118.90 = 31.26/x
  3. Step 3: Cross multiply
    79.32x = 118.90 × 31.26
  4. Step 4: Simplify right side
    79.32x = 3,716.81
  5. Step 5: Solve for x
    x = 3,716.81/79.32
  6. Step 6: Final answer
    x = 46.86

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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.