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Finding the Fourth Proportional to 445.69, 615.38 and 288.41

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Solution

The fourth proportional to 445.69, 615.38 and 288.41 is: 398.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.69 : 615.38 = 288.41 : x
  2. Step 2: Convert to fraction form
    445.69/615.38 = 288.41/x
  3. Step 3: Cross multiply
    445.69x = 615.38 × 288.41
  4. Step 4: Simplify right side
    445.69x = 177,477.23
  5. Step 5: Solve for x
    x = 177,477.23/445.69
  6. Step 6: Final answer
    x = 398.21

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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.