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Finding the Fourth Proportional to 2,839.39, 4,259.57 and 991.63

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Solution

The fourth proportional to 2,839.39, 4,259.57 and 991.63 is: 1,487.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,839.39 : 4,259.57 = 991.63 : x
  2. Step 2: Convert to fraction form
    2,839.39/4,259.57 = 991.63/x
  3. Step 3: Cross multiply
    2,839.39x = 4,259.57 × 991.63
  4. Step 4: Simplify right side
    2,839.39x = 4,223,917.40
  5. Step 5: Solve for x
    x = 4,223,917.40/2,839.39
  6. Step 6: Final answer
    x = 1,487.61

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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.