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Finding the Fourth Proportional to 916.78, 1,375.22 and 267.57

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Solution

The fourth proportional to 916.78, 1,375.22 and 267.57 is: 401.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.78 : 1,375.22 = 267.57 : x
  2. Step 2: Convert to fraction form
    916.78/1,375.22 = 267.57/x
  3. Step 3: Cross multiply
    916.78x = 1,375.22 × 267.57
  4. Step 4: Simplify right side
    916.78x = 367,967.62
  5. Step 5: Solve for x
    x = 367,967.62/916.78
  6. Step 6: Final answer
    x = 401.37

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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.