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Finding the Fourth Proportional to 445.77, 615.09 and 280.21

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Solution

The fourth proportional to 445.77, 615.09 and 280.21 is: 386.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.77 : 615.09 = 280.21 : x
  2. Step 2: Convert to fraction form
    445.77/615.09 = 280.21/x
  3. Step 3: Cross multiply
    445.77x = 615.09 × 280.21
  4. Step 4: Simplify right side
    445.77x = 172,355.04
  5. Step 5: Solve for x
    x = 172,355.04/445.77
  6. Step 6: Final answer
    x = 386.64

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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.