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Finding the Fourth Proportional to 1,939.96, 2,910.12 and 641.53

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Solution

The fourth proportional to 1,939.96, 2,910.12 and 641.53 is: 962.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.96 : 2,910.12 = 641.53 : x
  2. Step 2: Convert to fraction form
    1,939.96/2,910.12 = 641.53/x
  3. Step 3: Cross multiply
    1,939.96x = 2,910.12 × 641.53
  4. Step 4: Simplify right side
    1,939.96x = 1,866,929.28
  5. Step 5: Solve for x
    x = 1,866,929.28/1,939.96
  6. Step 6: Final answer
    x = 962.35

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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.