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Finding the Fourth Proportional to 548.44, 756.88 and 391.12

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Solution

The fourth proportional to 548.44, 756.88 and 391.12 is: 539.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.44 : 756.88 = 391.12 : x
  2. Step 2: Convert to fraction form
    548.44/756.88 = 391.12/x
  3. Step 3: Cross multiply
    548.44x = 756.88 × 391.12
  4. Step 4: Simplify right side
    548.44x = 296,030.91
  5. Step 5: Solve for x
    x = 296,030.91/548.44
  6. Step 6: Final answer
    x = 539.77

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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.