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Finding the Fourth Proportional to 402.47, 603.75 and 396.20

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Solution

The fourth proportional to 402.47, 603.75 and 396.20 is: 594.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.47 : 603.75 = 396.20 : x
  2. Step 2: Convert to fraction form
    402.47/603.75 = 396.20/x
  3. Step 3: Cross multiply
    402.47x = 603.75 × 396.20
  4. Step 4: Simplify right side
    402.47x = 239,205.75
  5. Step 5: Solve for x
    x = 239,205.75/402.47
  6. Step 6: Final answer
    x = 594.34

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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.