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Finding the Fourth Proportional to 392.98, 543.49 and 343.77

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Solution

The fourth proportional to 392.98, 543.49 and 343.77 is: 475.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.98 : 543.49 = 343.77 : x
  2. Step 2: Convert to fraction form
    392.98/543.49 = 343.77/x
  3. Step 3: Cross multiply
    392.98x = 543.49 × 343.77
  4. Step 4: Simplify right side
    392.98x = 186,834.70
  5. Step 5: Solve for x
    x = 186,834.70/392.98
  6. Step 6: Final answer
    x = 475.43

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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.