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Finding the Fourth Proportional to 79.98, 119.89 and 66.43

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Solution

The fourth proportional to 79.98, 119.89 and 66.43 is: 99.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.98 : 119.89 = 66.43 : x
  2. Step 2: Convert to fraction form
    79.98/119.89 = 66.43/x
  3. Step 3: Cross multiply
    79.98x = 119.89 × 66.43
  4. Step 4: Simplify right side
    79.98x = 7,964.29
  5. Step 5: Solve for x
    x = 7,964.29/79.98
  6. Step 6: Final answer
    x = 99.58

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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.