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Finding the Fourth Proportional to 1,938.73, 2,908.70 and 641.11

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Solution

The fourth proportional to 1,938.73, 2,908.70 and 641.11 is: 961.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.73 : 2,908.70 = 641.11 : x
  2. Step 2: Convert to fraction form
    1,938.73/2,908.70 = 641.11/x
  3. Step 3: Cross multiply
    1,938.73x = 2,908.70 × 641.11
  4. Step 4: Simplify right side
    1,938.73x = 1,864,790.99
  5. Step 5: Solve for x
    x = 1,864,790.99/1,938.73
  6. Step 6: Final answer
    x = 961.86

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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.