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Finding the Fourth Proportional to 1,568.78, 2,164.84 and 939.64

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Solution

The fourth proportional to 1,568.78, 2,164.84 and 939.64 is: 1,296.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.78 : 2,164.84 = 939.64 : x
  2. Step 2: Convert to fraction form
    1,568.78/2,164.84 = 939.64/x
  3. Step 3: Cross multiply
    1,568.78x = 2,164.84 × 939.64
  4. Step 4: Simplify right side
    1,568.78x = 2,034,170.26
  5. Step 5: Solve for x
    x = 2,034,170.26/1,568.78
  6. Step 6: Final answer
    x = 1,296.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.