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Finding the Fourth Proportional to 1,569.26, 2,163.90 and 979.64

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Solution

The fourth proportional to 1,569.26, 2,163.90 and 979.64 is: 1,350.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,569.26 : 2,163.90 = 979.64 : x
  2. Step 2: Convert to fraction form
    1,569.26/2,163.90 = 979.64/x
  3. Step 3: Cross multiply
    1,569.26x = 2,163.90 × 979.64
  4. Step 4: Simplify right side
    1,569.26x = 2,119,843.00
  5. Step 5: Solve for x
    x = 2,119,843.00/1,569.26
  6. Step 6: Final answer
    x = 1,350.86

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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.