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Finding the Fourth Proportional to 2,672.16, 4,006.44 and 939.84

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Solution

The fourth proportional to 2,672.16, 4,006.44 and 939.84 is: 1,409.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,672.16 : 4,006.44 = 939.84 : x
  2. Step 2: Convert to fraction form
    2,672.16/4,006.44 = 939.84/x
  3. Step 3: Cross multiply
    2,672.16x = 4,006.44 × 939.84
  4. Step 4: Simplify right side
    2,672.16x = 3,765,412.57
  5. Step 5: Solve for x
    x = 3,765,412.57/2,672.16
  6. Step 6: Final answer
    x = 1,409.13

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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.