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Finding the Fourth Proportional to 1,129.38, 1,694.10 and 399

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Solution

The fourth proportional to 1,129.38, 1,694.10 and 399 is: 598.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.38 : 1,694.10 = 399 : x
  2. Step 2: Convert to fraction form
    1,129.38/1,694.10 = 399/x
  3. Step 3: Cross multiply
    1,129.38x = 1,694.10 × 399
  4. Step 4: Simplify right side
    1,129.38x = 675,945.90
  5. Step 5: Solve for x
    x = 675,945.90/1,129.38
  6. Step 6: Final answer
    x = 598.51

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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.