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Finding the Fourth Proportional to 209.23, 313.67 and 105.05

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Solution

The fourth proportional to 209.23, 313.67 and 105.05 is: 157.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.23 : 313.67 = 105.05 : x
  2. Step 2: Convert to fraction form
    209.23/313.67 = 105.05/x
  3. Step 3: Cross multiply
    209.23x = 313.67 × 105.05
  4. Step 4: Simplify right side
    209.23x = 32,950.32
  5. Step 5: Solve for x
    x = 32,950.32/209.23
  6. Step 6: Final answer
    x = 157.48

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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.