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Finding the Fourth Proportional to 1,121.57, 1,682.49 and 472.22

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Solution

The fourth proportional to 1,121.57, 1,682.49 and 472.22 is: 708.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.57 : 1,682.49 = 472.22 : x
  2. Step 2: Convert to fraction form
    1,121.57/1,682.49 = 472.22/x
  3. Step 3: Cross multiply
    1,121.57x = 1,682.49 × 472.22
  4. Step 4: Simplify right side
    1,121.57x = 794,497.02
  5. Step 5: Solve for x
    x = 794,497.02/1,121.57
  6. Step 6: Final answer
    x = 708.38

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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.