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Finding the Fourth Proportional to 378.31, 522.26 and 261.67

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Solution

The fourth proportional to 378.31, 522.26 and 261.67 is: 361.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.31 : 522.26 = 261.67 : x
  2. Step 2: Convert to fraction form
    378.31/522.26 = 261.67/x
  3. Step 3: Cross multiply
    378.31x = 522.26 × 261.67
  4. Step 4: Simplify right side
    378.31x = 136,659.77
  5. Step 5: Solve for x
    x = 136,659.77/378.31
  6. Step 6: Final answer
    x = 361.24

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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.