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Finding the Fourth Proportional to 680.28, 1,020.42 and 551.76

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Solution

The fourth proportional to 680.28, 1,020.42 and 551.76 is: 827.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.28 : 1,020.42 = 551.76 : x
  2. Step 2: Convert to fraction form
    680.28/1,020.42 = 551.76/x
  3. Step 3: Cross multiply
    680.28x = 1,020.42 × 551.76
  4. Step 4: Simplify right side
    680.28x = 563,026.94
  5. Step 5: Solve for x
    x = 563,026.94/680.28
  6. Step 6: Final answer
    x = 827.64

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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.