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Finding the Fourth Proportional to 209.16, 314.25 and 186.12

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Solution

The fourth proportional to 209.16, 314.25 and 186.12 is: 279.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.16 : 314.25 = 186.12 : x
  2. Step 2: Convert to fraction form
    209.16/314.25 = 186.12/x
  3. Step 3: Cross multiply
    209.16x = 314.25 × 186.12
  4. Step 4: Simplify right side
    209.16x = 58,488.21
  5. Step 5: Solve for x
    x = 58,488.21/209.16
  6. Step 6: Final answer
    x = 279.63

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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.