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Finding the Fourth Proportional to 119.98, 165.41 and 80.57

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Solution

The fourth proportional to 119.98, 165.41 and 80.57 is: 111.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.98 : 165.41 = 80.57 : x
  2. Step 2: Convert to fraction form
    119.98/165.41 = 80.57/x
  3. Step 3: Cross multiply
    119.98x = 165.41 × 80.57
  4. Step 4: Simplify right side
    119.98x = 13,326.47
  5. Step 5: Solve for x
    x = 13,326.47/119.98
  6. Step 6: Final answer
    x = 111.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.