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Finding the Fourth Proportional to 1,912.39, 2,869.19 and 872.35

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Solution

The fourth proportional to 1,912.39, 2,869.19 and 872.35 is: 1,308.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.39 : 2,869.19 = 872.35 : x
  2. Step 2: Convert to fraction form
    1,912.39/2,869.19 = 872.35/x
  3. Step 3: Cross multiply
    1,912.39x = 2,869.19 × 872.35
  4. Step 4: Simplify right side
    1,912.39x = 2,502,937.90
  5. Step 5: Solve for x
    x = 2,502,937.90/1,912.39
  6. Step 6: Final answer
    x = 1,308.80

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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.