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Finding the Fourth Proportional to 548.56, 757.16 and 315.72

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Solution

The fourth proportional to 548.56, 757.16 and 315.72 is: 435.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.56 : 757.16 = 315.72 : x
  2. Step 2: Convert to fraction form
    548.56/757.16 = 315.72/x
  3. Step 3: Cross multiply
    548.56x = 757.16 × 315.72
  4. Step 4: Simplify right side
    548.56x = 239,050.56
  5. Step 5: Solve for x
    x = 239,050.56/548.56
  6. Step 6: Final answer
    x = 435.78

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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.