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Finding the Fourth Proportional to 1,759.41, 2,639.50 and 663.78

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Solution

The fourth proportional to 1,759.41, 2,639.50 and 663.78 is: 995.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,759.41 : 2,639.50 = 663.78 : x
  2. Step 2: Convert to fraction form
    1,759.41/2,639.50 = 663.78/x
  3. Step 3: Cross multiply
    1,759.41x = 2,639.50 × 663.78
  4. Step 4: Simplify right side
    1,759.41x = 1,752,047.31
  5. Step 5: Solve for x
    x = 1,752,047.31/1,759.41
  6. Step 6: Final answer
    x = 995.82

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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.