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Finding the Fourth Proportional to 1,126.98, 1,690.11 and 396.54

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Solution

The fourth proportional to 1,126.98, 1,690.11 and 396.54 is: 594.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.98 : 1,690.11 = 396.54 : x
  2. Step 2: Convert to fraction form
    1,126.98/1,690.11 = 396.54/x
  3. Step 3: Cross multiply
    1,126.98x = 1,690.11 × 396.54
  4. Step 4: Simplify right side
    1,126.98x = 670,196.22
  5. Step 5: Solve for x
    x = 670,196.22/1,126.98
  6. Step 6: Final answer
    x = 594.68

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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.