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Finding the Fourth Proportional to 680.40, 966.60 and 680.40

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Solution

The fourth proportional to 680.40, 966.60 and 680.40 is: 966.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.40 : 966.60 = 680.40 : x
  2. Step 2: Convert to fraction form
    680.40/966.60 = 680.40/x
  3. Step 3: Cross multiply
    680.40x = 966.60 × 680.40
  4. Step 4: Simplify right side
    680.40x = 657,674.64
  5. Step 5: Solve for x
    x = 657,674.64/680.40
  6. Step 6: Final answer
    x = 966.60

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These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.