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Finding the Fourth Proportional to 378.78, 522.39 and 267.11

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Solution

The fourth proportional to 378.78, 522.39 and 267.11 is: 368.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.78 : 522.39 = 267.11 : x
  2. Step 2: Convert to fraction form
    378.78/522.39 = 267.11/x
  3. Step 3: Cross multiply
    378.78x = 522.39 × 267.11
  4. Step 4: Simplify right side
    378.78x = 139,535.94
  5. Step 5: Solve for x
    x = 139,535.94/378.78
  6. Step 6: Final answer
    x = 368.39

Related Problems

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.