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Finding the Fourth Proportional to 447.85, 618.87 and 403.57

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Solution

The fourth proportional to 447.85, 618.87 and 403.57 is: 557.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.85 : 618.87 = 403.57 : x
  2. Step 2: Convert to fraction form
    447.85/618.87 = 403.57/x
  3. Step 3: Cross multiply
    447.85x = 618.87 × 403.57
  4. Step 4: Simplify right side
    447.85x = 249,757.37
  5. Step 5: Solve for x
    x = 249,757.37/447.85
  6. Step 6: Final answer
    x = 557.68

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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.