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Finding the Fourth Proportional to 209.57, 314.43 and 118.45

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Solution

The fourth proportional to 209.57, 314.43 and 118.45 is: 177.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.57 : 314.43 = 118.45 : x
  2. Step 2: Convert to fraction form
    209.57/314.43 = 118.45/x
  3. Step 3: Cross multiply
    209.57x = 314.43 × 118.45
  4. Step 4: Simplify right side
    209.57x = 37,244.23
  5. Step 5: Solve for x
    x = 37,244.23/209.57
  6. Step 6: Final answer
    x = 177.72

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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.