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Finding the Fourth Proportional to 410.72, 615.32 and 280.72

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Solution

The fourth proportional to 410.72, 615.32 and 280.72 is: 420.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.72 : 615.32 = 280.72 : x
  2. Step 2: Convert to fraction form
    410.72/615.32 = 280.72/x
  3. Step 3: Cross multiply
    410.72x = 615.32 × 280.72
  4. Step 4: Simplify right side
    410.72x = 172,732.63
  5. Step 5: Solve for x
    x = 172,732.63/410.72
  6. Step 6: Final answer
    x = 420.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.