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Finding the Fourth Proportional to 1,121.54, 1,682.64 and 428.22

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Solution

The fourth proportional to 1,121.54, 1,682.64 and 428.22 is: 642.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.54 : 1,682.64 = 428.22 : x
  2. Step 2: Convert to fraction form
    1,121.54/1,682.64 = 428.22/x
  3. Step 3: Cross multiply
    1,121.54x = 1,682.64 × 428.22
  4. Step 4: Simplify right side
    1,121.54x = 720,540.10
  5. Step 5: Solve for x
    x = 720,540.10/1,121.54
  6. Step 6: Final answer
    x = 642.46

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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.