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Finding the Fourth Proportional to 209.45, 288.92 and 154.17

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Solution

The fourth proportional to 209.45, 288.92 and 154.17 is: 212.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.45 : 288.92 = 154.17 : x
  2. Step 2: Convert to fraction form
    209.45/288.92 = 154.17/x
  3. Step 3: Cross multiply
    209.45x = 288.92 × 154.17
  4. Step 4: Simplify right side
    209.45x = 44,543.18
  5. Step 5: Solve for x
    x = 44,543.18/209.45
  6. Step 6: Final answer
    x = 212.66

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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.