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Finding the Fourth Proportional to 548.70, 757.20 and 315.78

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Solution

The fourth proportional to 548.70, 757.20 and 315.78 is: 435.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.70 : 757.20 = 315.78 : x
  2. Step 2: Convert to fraction form
    548.70/757.20 = 315.78/x
  3. Step 3: Cross multiply
    548.70x = 757.20 × 315.78
  4. Step 4: Simplify right side
    548.70x = 239,108.62
  5. Step 5: Solve for x
    x = 239,108.62/548.70
  6. Step 6: Final answer
    x = 435.77

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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.