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Finding the Fourth Proportional to 79.50, 119.26 and 53.91

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Solution

The fourth proportional to 79.50, 119.26 and 53.91 is: 80.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.50 : 119.26 = 53.91 : x
  2. Step 2: Convert to fraction form
    79.50/119.26 = 53.91/x
  3. Step 3: Cross multiply
    79.50x = 119.26 × 53.91
  4. Step 4: Simplify right side
    79.50x = 6,429.31
  5. Step 5: Solve for x
    x = 6,429.31/79.50
  6. Step 6: Final answer
    x = 80.87

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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.