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Finding the Fourth Proportional to 1,188.20, 1,639.78 and 768.62

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Solution

The fourth proportional to 1,188.20, 1,639.78 and 768.62 is: 1,060.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.20 : 1,639.78 = 768.62 : x
  2. Step 2: Convert to fraction form
    1,188.20/1,639.78 = 768.62/x
  3. Step 3: Cross multiply
    1,188.20x = 1,639.78 × 768.62
  4. Step 4: Simplify right side
    1,188.20x = 1,260,367.70
  5. Step 5: Solve for x
    x = 1,260,367.70/1,188.20
  6. Step 6: Final answer
    x = 1,060.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.