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Finding the Fourth Proportional to 209.06, 313.62 and 100.83

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Solution

The fourth proportional to 209.06, 313.62 and 100.83 is: 151.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.06 : 313.62 = 100.83 : x
  2. Step 2: Convert to fraction form
    209.06/313.62 = 100.83/x
  3. Step 3: Cross multiply
    209.06x = 313.62 × 100.83
  4. Step 4: Simplify right side
    209.06x = 31,621.91
  5. Step 5: Solve for x
    x = 31,621.91/209.06
  6. Step 6: Final answer
    x = 151.25

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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.