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Finding the Fourth Proportional to 2,139.80, 3,208.62 and 752.90

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Solution

The fourth proportional to 2,139.80, 3,208.62 and 752.90 is: 1,128.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.80 : 3,208.62 = 752.90 : x
  2. Step 2: Convert to fraction form
    2,139.80/3,208.62 = 752.90/x
  3. Step 3: Cross multiply
    2,139.80x = 3,208.62 × 752.90
  4. Step 4: Simplify right side
    2,139.80x = 2,415,770.00
  5. Step 5: Solve for x
    x = 2,415,770.00/2,139.80
  6. Step 6: Final answer
    x = 1,128.97

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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.