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Finding the Fourth Proportional to 117.41, 161.99 and 86.39

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Solution

The fourth proportional to 117.41, 161.99 and 86.39 is: 119.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.41 : 161.99 = 86.39 : x
  2. Step 2: Convert to fraction form
    117.41/161.99 = 86.39/x
  3. Step 3: Cross multiply
    117.41x = 161.99 × 86.39
  4. Step 4: Simplify right side
    117.41x = 13,993.88
  5. Step 5: Solve for x
    x = 13,993.88/117.41
  6. Step 6: Final answer
    x = 119.19

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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.