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Finding the Fourth Proportional to 392.45, 540.37 and 347.54

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Solution

The fourth proportional to 392.45, 540.37 and 347.54 is: 478.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.45 : 540.37 = 347.54 : x
  2. Step 2: Convert to fraction form
    392.45/540.37 = 347.54/x
  3. Step 3: Cross multiply
    392.45x = 540.37 × 347.54
  4. Step 4: Simplify right side
    392.45x = 187,800.96
  5. Step 5: Solve for x
    x = 187,800.96/392.45
  6. Step 6: Final answer
    x = 478.54

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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.