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Finding the Fourth Proportional to 1,229.67, 1,830.79 and 1,212.44

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Solution

The fourth proportional to 1,229.67, 1,830.79 and 1,212.44 is: 1,805.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.67 : 1,830.79 = 1,212.44 : x
  2. Step 2: Convert to fraction form
    1,229.67/1,830.79 = 1,212.44/x
  3. Step 3: Cross multiply
    1,229.67x = 1,830.79 × 1,212.44
  4. Step 4: Simplify right side
    1,229.67x = 2,219,715.39
  5. Step 5: Solve for x
    x = 2,219,715.39/1,229.67
  6. Step 6: Final answer
    x = 1,805.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.