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Finding the Fourth Proportional to 548.92, 756.54 and 393.40

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Solution

The fourth proportional to 548.92, 756.54 and 393.40 is: 542.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.92 : 756.54 = 393.40 : x
  2. Step 2: Convert to fraction form
    548.92/756.54 = 393.40/x
  3. Step 3: Cross multiply
    548.92x = 756.54 × 393.40
  4. Step 4: Simplify right side
    548.92x = 297,622.84
  5. Step 5: Solve for x
    x = 297,622.84/548.92
  6. Step 6: Final answer
    x = 542.20

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Double scale
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Similar ratio
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1.5x scale

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.