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Finding the Fourth Proportional to 117.30, 161.20 and 111.95

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Solution

The fourth proportional to 117.30, 161.20 and 111.95 is: 153.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.30 : 161.20 = 111.95 : x
  2. Step 2: Convert to fraction form
    117.30/161.20 = 111.95/x
  3. Step 3: Cross multiply
    117.30x = 161.20 × 111.95
  4. Step 4: Simplify right side
    117.30x = 18,045.25
  5. Step 5: Solve for x
    x = 18,045.25/117.30
  6. Step 6: Final answer
    x = 153.84

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.