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Finding the Fourth Proportional to 209.30, 314.18 and 118.09

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Solution

The fourth proportional to 209.30, 314.18 and 118.09 is: 177.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.30 : 314.18 = 118.09 : x
  2. Step 2: Convert to fraction form
    209.30/314.18 = 118.09/x
  3. Step 3: Cross multiply
    209.30x = 314.18 × 118.09
  4. Step 4: Simplify right side
    209.30x = 37,101.52
  5. Step 5: Solve for x
    x = 37,101.52/209.30
  6. Step 6: Final answer
    x = 177.26

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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.