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Finding the Fourth Proportional to 418.04, 625.90 and 280.80

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Solution

The fourth proportional to 418.04, 625.90 and 280.80 is: 420.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.04 : 625.90 = 280.80 : x
  2. Step 2: Convert to fraction form
    418.04/625.90 = 280.80/x
  3. Step 3: Cross multiply
    418.04x = 625.90 × 280.80
  4. Step 4: Simplify right side
    418.04x = 175,752.72
  5. Step 5: Solve for x
    x = 175,752.72/418.04
  6. Step 6: Final answer
    x = 420.42

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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.