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Finding the Fourth Proportional to 445.72, 615.09 and 288.41

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Solution

The fourth proportional to 445.72, 615.09 and 288.41 is: 398.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.72 : 615.09 = 288.41 : x
  2. Step 2: Convert to fraction form
    445.72/615.09 = 288.41/x
  3. Step 3: Cross multiply
    445.72x = 615.09 × 288.41
  4. Step 4: Simplify right side
    445.72x = 177,399.57
  5. Step 5: Solve for x
    x = 177,399.57/445.72
  6. Step 6: Final answer
    x = 398.01

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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.