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Finding the Fourth Proportional to 190.80, 263.39 and 117.15

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Solution

The fourth proportional to 190.80, 263.39 and 117.15 is: 161.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.80 : 263.39 = 117.15 : x
  2. Step 2: Convert to fraction form
    190.80/263.39 = 117.15/x
  3. Step 3: Cross multiply
    190.80x = 263.39 × 117.15
  4. Step 4: Simplify right side
    190.80x = 30,856.14
  5. Step 5: Solve for x
    x = 30,856.14/190.80
  6. Step 6: Final answer
    x = 161.72

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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.