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Finding the Fourth Proportional to 209.39, 314.28 and 157.85

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Solution

The fourth proportional to 209.39, 314.28 and 157.85 is: 236.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.39 : 314.28 = 157.85 : x
  2. Step 2: Convert to fraction form
    209.39/314.28 = 157.85/x
  3. Step 3: Cross multiply
    209.39x = 314.28 × 157.85
  4. Step 4: Simplify right side
    209.39x = 49,608.71
  5. Step 5: Solve for x
    x = 49,608.71/209.39
  6. Step 6: Final answer
    x = 236.93

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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.