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Finding the Fourth Proportional to 548.78, 757.35 and 315.94

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Solution

The fourth proportional to 548.78, 757.35 and 315.94 is: 436.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.78 : 757.35 = 315.94 : x
  2. Step 2: Convert to fraction form
    548.78/757.35 = 315.94/x
  3. Step 3: Cross multiply
    548.78x = 757.35 × 315.94
  4. Step 4: Simplify right side
    548.78x = 239,277.16
  5. Step 5: Solve for x
    x = 239,277.16/548.78
  6. Step 6: Final answer
    x = 436.02

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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.