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Finding the Fourth Proportional to 445.74, 615.48 and 399.03

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Solution

The fourth proportional to 445.74, 615.48 and 399.03 is: 550.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.74 : 615.48 = 399.03 : x
  2. Step 2: Convert to fraction form
    445.74/615.48 = 399.03/x
  3. Step 3: Cross multiply
    445.74x = 615.48 × 399.03
  4. Step 4: Simplify right side
    445.74x = 245,594.98
  5. Step 5: Solve for x
    x = 245,594.98/445.74
  6. Step 6: Final answer
    x = 550.98

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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.