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Finding the Fourth Proportional to 1,129.36, 1,694.06 and 398.92

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Solution

The fourth proportional to 1,129.36, 1,694.06 and 398.92 is: 598.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.36 : 1,694.06 = 398.92 : x
  2. Step 2: Convert to fraction form
    1,129.36/1,694.06 = 398.92/x
  3. Step 3: Cross multiply
    1,129.36x = 1,694.06 × 398.92
  4. Step 4: Simplify right side
    1,129.36x = 675,794.42
  5. Step 5: Solve for x
    x = 675,794.42/1,129.36
  6. Step 6: Final answer
    x = 598.39

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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.