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Finding the Fourth Proportional to 680.82, 1,017.06 and 656.52

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Solution

The fourth proportional to 680.82, 1,017.06 and 656.52 is: 980.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.82 : 1,017.06 = 656.52 : x
  2. Step 2: Convert to fraction form
    680.82/1,017.06 = 656.52/x
  3. Step 3: Cross multiply
    680.82x = 1,017.06 × 656.52
  4. Step 4: Simplify right side
    680.82x = 667,720.23
  5. Step 5: Solve for x
    x = 667,720.23/680.82
  6. Step 6: Final answer
    x = 980.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.