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Finding the Fourth Proportional to 418.80, 628.31 and 287.55

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Solution

The fourth proportional to 418.80, 628.31 and 287.55 is: 431.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.80 : 628.31 = 287.55 : x
  2. Step 2: Convert to fraction form
    418.80/628.31 = 287.55/x
  3. Step 3: Cross multiply
    418.80x = 628.31 × 287.55
  4. Step 4: Simplify right side
    418.80x = 180,669.64
  5. Step 5: Solve for x
    x = 180,669.64/418.80
  6. Step 6: Final answer
    x = 431.40

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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.