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Finding the Fourth Proportional to 209.64, 289.12 and 154.38

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Solution

The fourth proportional to 209.64, 289.12 and 154.38 is: 212.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.64 : 289.12 = 154.38 : x
  2. Step 2: Convert to fraction form
    209.64/289.12 = 154.38/x
  3. Step 3: Cross multiply
    209.64x = 289.12 × 154.38
  4. Step 4: Simplify right side
    209.64x = 44,634.35
  5. Step 5: Solve for x
    x = 44,634.35/209.64
  6. Step 6: Final answer
    x = 212.91

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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.