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Finding the Fourth Proportional to 2,619.26, 3,928.65 and 887.78

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Solution

The fourth proportional to 2,619.26, 3,928.65 and 887.78 is: 1,331.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.26 : 3,928.65 = 887.78 : x
  2. Step 2: Convert to fraction form
    2,619.26/3,928.65 = 887.78/x
  3. Step 3: Cross multiply
    2,619.26x = 3,928.65 × 887.78
  4. Step 4: Simplify right side
    2,619.26x = 3,487,776.90
  5. Step 5: Solve for x
    x = 3,487,776.90/2,619.26
  6. Step 6: Final answer
    x = 1,331.59

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1.5x scale

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.