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Finding the Fourth Proportional to 722.08, 1,083.12 and 209.08

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Solution

The fourth proportional to 722.08, 1,083.12 and 209.08 is: 313.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.08 : 1,083.12 = 209.08 : x
  2. Step 2: Convert to fraction form
    722.08/1,083.12 = 209.08/x
  3. Step 3: Cross multiply
    722.08x = 1,083.12 × 209.08
  4. Step 4: Simplify right side
    722.08x = 226,458.73
  5. Step 5: Solve for x
    x = 226,458.73/722.08
  6. Step 6: Final answer
    x = 313.62

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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.