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Finding the Fourth Proportional to 722.19, 1,083.46 and 209.19

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Solution

The fourth proportional to 722.19, 1,083.46 and 209.19 is: 313.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.19 : 1,083.46 = 209.19 : x
  2. Step 2: Convert to fraction form
    722.19/1,083.46 = 209.19/x
  3. Step 3: Cross multiply
    722.19x = 1,083.46 × 209.19
  4. Step 4: Simplify right side
    722.19x = 226,649.00
  5. Step 5: Solve for x
    x = 226,649.00/722.19
  6. Step 6: Final answer
    x = 313.84

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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.