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Finding the Fourth Proportional to 548.40, 757.05 and 423.78

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Solution

The fourth proportional to 548.40, 757.05 and 423.78 is: 585.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.40 : 757.05 = 423.78 : x
  2. Step 2: Convert to fraction form
    548.40/757.05 = 423.78/x
  3. Step 3: Cross multiply
    548.40x = 757.05 × 423.78
  4. Step 4: Simplify right side
    548.40x = 320,822.65
  5. Step 5: Solve for x
    x = 320,822.65/548.40
  6. Step 6: Final answer
    x = 585.02

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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.