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Finding the Fourth Proportional to 447.80, 618.06 and 281.90

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Solution

The fourth proportional to 447.80, 618.06 and 281.90 is: 389.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.80 : 618.06 = 281.90 : x
  2. Step 2: Convert to fraction form
    447.80/618.06 = 281.90/x
  3. Step 3: Cross multiply
    447.80x = 618.06 × 281.90
  4. Step 4: Simplify right side
    447.80x = 174,231.11
  5. Step 5: Solve for x
    x = 174,231.11/447.80
  6. Step 6: Final answer
    x = 389.08

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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.