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Finding the Fourth Proportional to 209.52, 313.85 and 118.02

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Solution

The fourth proportional to 209.52, 313.85 and 118.02 is: 176.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.52 : 313.85 = 118.02 : x
  2. Step 2: Convert to fraction form
    209.52/313.85 = 118.02/x
  3. Step 3: Cross multiply
    209.52x = 313.85 × 118.02
  4. Step 4: Simplify right side
    209.52x = 37,042.05
  5. Step 5: Solve for x
    x = 37,042.05/209.52
  6. Step 6: Final answer
    x = 176.79

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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.