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Finding the Fourth Proportional to 1,126.39, 1,689.81 and 396.48

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Solution

The fourth proportional to 1,126.39, 1,689.81 and 396.48 is: 594.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.39 : 1,689.81 = 396.48 : x
  2. Step 2: Convert to fraction form
    1,126.39/1,689.81 = 396.48/x
  3. Step 3: Cross multiply
    1,126.39x = 1,689.81 × 396.48
  4. Step 4: Simplify right side
    1,126.39x = 669,975.87
  5. Step 5: Solve for x
    x = 669,975.87/1,126.39
  6. Step 6: Final answer
    x = 594.80

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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.