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Finding the Fourth Proportional to 209.08, 312.81 and 168.58

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Solution

The fourth proportional to 209.08, 312.81 and 168.58 is: 252.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.08 : 312.81 = 168.58 : x
  2. Step 2: Convert to fraction form
    209.08/312.81 = 168.58/x
  3. Step 3: Cross multiply
    209.08x = 312.81 × 168.58
  4. Step 4: Simplify right side
    209.08x = 52,733.51
  5. Step 5: Solve for x
    x = 52,733.51/209.08
  6. Step 6: Final answer
    x = 252.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.