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Finding the Fourth Proportional to 1,299.78, 1,949.17 and 422.07

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Solution

The fourth proportional to 1,299.78, 1,949.17 and 422.07 is: 632.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.78 : 1,949.17 = 422.07 : x
  2. Step 2: Convert to fraction form
    1,299.78/1,949.17 = 422.07/x
  3. Step 3: Cross multiply
    1,299.78x = 1,949.17 × 422.07
  4. Step 4: Simplify right side
    1,299.78x = 822,694.02
  5. Step 5: Solve for x
    x = 822,694.02/1,299.78
  6. Step 6: Final answer
    x = 632.95

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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.