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Finding the Fourth Proportional to 1,286.57, 1,929.55 and 362.21

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Solution

The fourth proportional to 1,286.57, 1,929.55 and 362.21 is: 543.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.57 : 1,929.55 = 362.21 : x
  2. Step 2: Convert to fraction form
    1,286.57/1,929.55 = 362.21/x
  3. Step 3: Cross multiply
    1,286.57x = 1,929.55 × 362.21
  4. Step 4: Simplify right side
    1,286.57x = 698,906.22
  5. Step 5: Solve for x
    x = 698,906.22/1,286.57
  6. Step 6: Final answer
    x = 543.23

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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.