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Finding the Fourth Proportional to 548.40, 820.92 and 426

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Solution

The fourth proportional to 548.40, 820.92 and 426 is: 637.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.40 : 820.92 = 426 : x
  2. Step 2: Convert to fraction form
    548.40/820.92 = 426/x
  3. Step 3: Cross multiply
    548.40x = 820.92 × 426
  4. Step 4: Simplify right side
    548.40x = 349,711.92
  5. Step 5: Solve for x
    x = 349,711.92/548.40
  6. Step 6: Final answer
    x = 637.69

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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.