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Finding the Fourth Proportional to 680.77, 1,020.48 and 517.96

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Solution

The fourth proportional to 680.77, 1,020.48 and 517.96 is: 776.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.77 : 1,020.48 = 517.96 : x
  2. Step 2: Convert to fraction form
    680.77/1,020.48 = 517.96/x
  3. Step 3: Cross multiply
    680.77x = 1,020.48 × 517.96
  4. Step 4: Simplify right side
    680.77x = 528,567.82
  5. Step 5: Solve for x
    x = 528,567.82/680.77
  6. Step 6: Final answer
    x = 776.43

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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.