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Finding the Fourth Proportional to 680.81, 1,019.21 and 610.47

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Solution

The fourth proportional to 680.81, 1,019.21 and 610.47 is: 913.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.81 : 1,019.21 = 610.47 : x
  2. Step 2: Convert to fraction form
    680.81/1,019.21 = 610.47/x
  3. Step 3: Cross multiply
    680.81x = 1,019.21 × 610.47
  4. Step 4: Simplify right side
    680.81x = 622,194.08
  5. Step 5: Solve for x
    x = 622,194.08/680.81
  6. Step 6: Final answer
    x = 913.91

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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.