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Finding the Fourth Proportional to 447.90, 618.09 and 251.40

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Solution

The fourth proportional to 447.90, 618.09 and 251.40 is: 346.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.90 : 618.09 = 251.40 : x
  2. Step 2: Convert to fraction form
    447.90/618.09 = 251.40/x
  3. Step 3: Cross multiply
    447.90x = 618.09 × 251.40
  4. Step 4: Simplify right side
    447.90x = 155,387.83
  5. Step 5: Solve for x
    x = 155,387.83/447.90
  6. Step 6: Final answer
    x = 346.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.