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Finding the Fourth Proportional to 1,912.79, 2,869.86 and 939.44

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Solution

The fourth proportional to 1,912.79, 2,869.86 and 939.44 is: 1,409.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.79 : 2,869.86 = 939.44 : x
  2. Step 2: Convert to fraction form
    1,912.79/2,869.86 = 939.44/x
  3. Step 3: Cross multiply
    1,912.79x = 2,869.86 × 939.44
  4. Step 4: Simplify right side
    1,912.79x = 2,696,061.28
  5. Step 5: Solve for x
    x = 2,696,061.28/1,912.79
  6. Step 6: Final answer
    x = 1,409.49

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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.