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Finding the Fourth Proportional to 1,131.78, 1,697.55 and 401.26

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Solution

The fourth proportional to 1,131.78, 1,697.55 and 401.26 is: 601.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.78 : 1,697.55 = 401.26 : x
  2. Step 2: Convert to fraction form
    1,131.78/1,697.55 = 401.26/x
  3. Step 3: Cross multiply
    1,131.78x = 1,697.55 × 401.26
  4. Step 4: Simplify right side
    1,131.78x = 681,158.91
  5. Step 5: Solve for x
    x = 681,158.91/1,131.78
  6. Step 6: Final answer
    x = 601.85

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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.