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Finding the Fourth Proportional to 79.19, 118.72 and 31.09

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Solution

The fourth proportional to 79.19, 118.72 and 31.09 is: 46.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.19 : 118.72 = 31.09 : x
  2. Step 2: Convert to fraction form
    79.19/118.72 = 31.09/x
  3. Step 3: Cross multiply
    79.19x = 118.72 × 31.09
  4. Step 4: Simplify right side
    79.19x = 3,690.26
  5. Step 5: Solve for x
    x = 3,690.26/79.19
  6. Step 6: Final answer
    x = 46.60

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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.