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Finding the Fourth Proportional to 79.88, 119.70 and 72.39

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Solution

The fourth proportional to 79.88, 119.70 and 72.39 is: 108.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.88 : 119.70 = 72.39 : x
  2. Step 2: Convert to fraction form
    79.88/119.70 = 72.39/x
  3. Step 3: Cross multiply
    79.88x = 119.70 × 72.39
  4. Step 4: Simplify right side
    79.88x = 8,665.08
  5. Step 5: Solve for x
    x = 8,665.08/79.88
  6. Step 6: Final answer
    x = 108.47

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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.