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Finding the Fourth Proportional to 393.80, 543.20 and 253.86

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Solution

The fourth proportional to 393.80, 543.20 and 253.86 is: 350.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.80 : 543.20 = 253.86 : x
  2. Step 2: Convert to fraction form
    393.80/543.20 = 253.86/x
  3. Step 3: Cross multiply
    393.80x = 543.20 × 253.86
  4. Step 4: Simplify right side
    393.80x = 137,895.48
  5. Step 5: Solve for x
    x = 137,895.48/393.80
  6. Step 6: Final answer
    x = 350.17

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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.