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Finding the Fourth Proportional to 209.01, 313.59 and 100.79

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Solution

The fourth proportional to 209.01, 313.59 and 100.79 is: 151.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.01 : 313.59 = 100.79 : x
  2. Step 2: Convert to fraction form
    209.01/313.59 = 100.79/x
  3. Step 3: Cross multiply
    209.01x = 313.59 × 100.79
  4. Step 4: Simplify right side
    209.01x = 31,604.66
  5. Step 5: Solve for x
    x = 31,604.66/209.01
  6. Step 6: Final answer
    x = 151.21

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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.