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Finding the Fourth Proportional to 1,199.26, 1,798.80 and 979.57

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Solution

The fourth proportional to 1,199.26, 1,798.80 and 979.57 is: 1,469.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.26 : 1,798.80 = 979.57 : x
  2. Step 2: Convert to fraction form
    1,199.26/1,798.80 = 979.57/x
  3. Step 3: Cross multiply
    1,199.26x = 1,798.80 × 979.57
  4. Step 4: Simplify right side
    1,199.26x = 1,762,050.52
  5. Step 5: Solve for x
    x = 1,762,050.52/1,199.26
  6. Step 6: Final answer
    x = 1,469.28

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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.