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Finding the Fourth Proportional to 828.22, 1,242.36 and 280.46

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Solution

The fourth proportional to 828.22, 1,242.36 and 280.46 is: 420.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.22 : 1,242.36 = 280.46 : x
  2. Step 2: Convert to fraction form
    828.22/1,242.36 = 280.46/x
  3. Step 3: Cross multiply
    828.22x = 1,242.36 × 280.46
  4. Step 4: Simplify right side
    828.22x = 348,432.29
  5. Step 5: Solve for x
    x = 348,432.29/828.22
  6. Step 6: Final answer
    x = 420.70

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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.