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Finding the Fourth Proportional to 1,939.97, 2,910.18 and 641.45

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Solution

The fourth proportional to 1,939.97, 2,910.18 and 641.45 is: 962.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.97 : 2,910.18 = 641.45 : x
  2. Step 2: Convert to fraction form
    1,939.97/2,910.18 = 641.45/x
  3. Step 3: Cross multiply
    1,939.97x = 2,910.18 × 641.45
  4. Step 4: Simplify right side
    1,939.97x = 1,866,734.96
  5. Step 5: Solve for x
    x = 1,866,734.96/1,939.97
  6. Step 6: Final answer
    x = 962.25

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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.