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Finding the Fourth Proportional to 1,009.44, 1,391.08 and 869.52

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Solution

The fourth proportional to 1,009.44, 1,391.08 and 869.52 is: 1,198.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.44 : 1,391.08 = 869.52 : x
  2. Step 2: Convert to fraction form
    1,009.44/1,391.08 = 869.52/x
  3. Step 3: Cross multiply
    1,009.44x = 1,391.08 × 869.52
  4. Step 4: Simplify right side
    1,009.44x = 1,209,571.88
  5. Step 5: Solve for x
    x = 1,209,571.88/1,009.44
  6. Step 6: Final answer
    x = 1,198.26

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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.