Home / 1,126.80-1,690.49-396.45

Finding the Fourth Proportional to 1,126.80, 1,690.49 and 396.45

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Solution

The fourth proportional to 1,126.80, 1,690.49 and 396.45 is: 594.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.80 : 1,690.49 = 396.45 : x
  2. Step 2: Convert to fraction form
    1,126.80/1,690.49 = 396.45/x
  3. Step 3: Cross multiply
    1,126.80x = 1,690.49 × 396.45
  4. Step 4: Simplify right side
    1,126.80x = 670,192.78
  5. Step 5: Solve for x
    x = 670,192.78/1,126.80
  6. Step 6: Final answer
    x = 594.78

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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.