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Finding the Fourth Proportional to 393.68, 543.73 and 283.31

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Solution

The fourth proportional to 393.68, 543.73 and 283.31 is: 391.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.68 : 543.73 = 283.31 : x
  2. Step 2: Convert to fraction form
    393.68/543.73 = 283.31/x
  3. Step 3: Cross multiply
    393.68x = 543.73 × 283.31
  4. Step 4: Simplify right side
    393.68x = 154,044.80
  5. Step 5: Solve for x
    x = 154,044.80/393.68
  6. Step 6: Final answer
    x = 391.30

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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.