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Finding the Fourth Proportional to 828.38, 1,242.71 and 280.68

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Solution

The fourth proportional to 828.38, 1,242.71 and 280.68 is: 421.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.38 : 1,242.71 = 280.68 : x
  2. Step 2: Convert to fraction form
    828.38/1,242.71 = 280.68/x
  3. Step 3: Cross multiply
    828.38x = 1,242.71 × 280.68
  4. Step 4: Simplify right side
    828.38x = 348,802.44
  5. Step 5: Solve for x
    x = 348,802.44/828.38
  6. Step 6: Final answer
    x = 421.07

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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.