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Finding the Fourth Proportional to 548.62, 756.92 and 391.12

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Solution

The fourth proportional to 548.62, 756.92 and 391.12 is: 539.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.62 : 756.92 = 391.12 : x
  2. Step 2: Convert to fraction form
    548.62/756.92 = 391.12/x
  3. Step 3: Cross multiply
    548.62x = 756.92 × 391.12
  4. Step 4: Simplify right side
    548.62x = 296,047.53
  5. Step 5: Solve for x
    x = 296,047.53/548.62
  6. Step 6: Final answer
    x = 539.62

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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.