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Finding the Fourth Proportional to 418.80, 628.80 and 297.60

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Solution

The fourth proportional to 418.80, 628.80 and 297.60 is: 446.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.80 : 628.80 = 297.60 : x
  2. Step 2: Convert to fraction form
    418.80/628.80 = 297.60/x
  3. Step 3: Cross multiply
    418.80x = 628.80 × 297.60
  4. Step 4: Simplify right side
    418.80x = 187,130.88
  5. Step 5: Solve for x
    x = 187,130.88/418.80
  6. Step 6: Final answer
    x = 446.83

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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.