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Finding the Fourth Proportional to 79.89, 119.70 and 36.49

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Solution

The fourth proportional to 79.89, 119.70 and 36.49 is: 54.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.89 : 119.70 = 36.49 : x
  2. Step 2: Convert to fraction form
    79.89/119.70 = 36.49/x
  3. Step 3: Cross multiply
    79.89x = 119.70 × 36.49
  4. Step 4: Simplify right side
    79.89x = 4,368.24
  5. Step 5: Solve for x
    x = 4,368.24/79.89
  6. Step 6: Final answer
    x = 54.68

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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.