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Finding the Fourth Proportional to 680.89, 1,020.28 and 484.98

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Solution

The fourth proportional to 680.89, 1,020.28 and 484.98 is: 726.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.89 : 1,020.28 = 484.98 : x
  2. Step 2: Convert to fraction form
    680.89/1,020.28 = 484.98/x
  3. Step 3: Cross multiply
    680.89x = 1,020.28 × 484.98
  4. Step 4: Simplify right side
    680.89x = 494,815.39
  5. Step 5: Solve for x
    x = 494,815.39/680.89
  6. Step 6: Final answer
    x = 726.72

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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.