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Finding the Fourth Proportional to 402.80, 603.24 and 393.08

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Solution

The fourth proportional to 402.80, 603.24 and 393.08 is: 588.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.80 : 603.24 = 393.08 : x
  2. Step 2: Convert to fraction form
    402.80/603.24 = 393.08/x
  3. Step 3: Cross multiply
    402.80x = 603.24 × 393.08
  4. Step 4: Simplify right side
    402.80x = 237,121.58
  5. Step 5: Solve for x
    x = 237,121.58/402.80
  6. Step 6: Final answer
    x = 588.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.