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Finding the Fourth Proportional to 680.78, 1,020.44 and 499.02

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Solution

The fourth proportional to 680.78, 1,020.44 and 499.02 is: 747.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.78 : 1,020.44 = 499.02 : x
  2. Step 2: Convert to fraction form
    680.78/1,020.44 = 499.02/x
  3. Step 3: Cross multiply
    680.78x = 1,020.44 × 499.02
  4. Step 4: Simplify right side
    680.78x = 509,219.97
  5. Step 5: Solve for x
    x = 509,219.97/680.78
  6. Step 6: Final answer
    x = 747.99

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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.