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Finding the Fourth Proportional to 445.79, 615.21 and 280.14

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Solution

The fourth proportional to 445.79, 615.21 and 280.14 is: 386.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.79 : 615.21 = 280.14 : x
  2. Step 2: Convert to fraction form
    445.79/615.21 = 280.14/x
  3. Step 3: Cross multiply
    445.79x = 615.21 × 280.14
  4. Step 4: Simplify right side
    445.79x = 172,344.93
  5. Step 5: Solve for x
    x = 172,344.93/445.79
  6. Step 6: Final answer
    x = 386.61

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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.