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Finding the Fourth Proportional to 209.50, 313.88 and 111.80

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Solution

The fourth proportional to 209.50, 313.88 and 111.80 is: 167.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.50 : 313.88 = 111.80 : x
  2. Step 2: Convert to fraction form
    209.50/313.88 = 111.80/x
  3. Step 3: Cross multiply
    209.50x = 313.88 × 111.80
  4. Step 4: Simplify right side
    209.50x = 35,090.87
  5. Step 5: Solve for x
    x = 35,090.87/209.50
  6. Step 6: Final answer
    x = 167.50

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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.