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Finding the Fourth Proportional to 680.55, 1,020.01 and 517.74

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Solution

The fourth proportional to 680.55, 1,020.01 and 517.74 is: 775.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.55 : 1,020.01 = 517.74 : x
  2. Step 2: Convert to fraction form
    680.55/1,020.01 = 517.74/x
  3. Step 3: Cross multiply
    680.55x = 1,020.01 × 517.74
  4. Step 4: Simplify right side
    680.55x = 528,099.98
  5. Step 5: Solve for x
    x = 528,099.98/680.55
  6. Step 6: Final answer
    x = 775.99

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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.