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Finding the Fourth Proportional to 680.46, 1,019.62 and 654.85

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Solution

The fourth proportional to 680.46, 1,019.62 and 654.85 is: 981.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.46 : 1,019.62 = 654.85 : x
  2. Step 2: Convert to fraction form
    680.46/1,019.62 = 654.85/x
  3. Step 3: Cross multiply
    680.46x = 1,019.62 × 654.85
  4. Step 4: Simplify right side
    680.46x = 667,698.16
  5. Step 5: Solve for x
    x = 667,698.16/680.46
  6. Step 6: Final answer
    x = 981.25

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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.