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Finding the Fourth Proportional to 209.19, 288.70 and 115.95

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Solution

The fourth proportional to 209.19, 288.70 and 115.95 is: 160.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.19 : 288.70 = 115.95 : x
  2. Step 2: Convert to fraction form
    209.19/288.70 = 115.95/x
  3. Step 3: Cross multiply
    209.19x = 288.70 × 115.95
  4. Step 4: Simplify right side
    209.19x = 33,474.77
  5. Step 5: Solve for x
    x = 33,474.77/209.19
  6. Step 6: Final answer
    x = 160.02

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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.