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Finding the Fourth Proportional to 1,163.88, 1,744.40 and 815.32

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Solution

The fourth proportional to 1,163.88, 1,744.40 and 815.32 is: 1,221.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.88 : 1,744.40 = 815.32 : x
  2. Step 2: Convert to fraction form
    1,163.88/1,744.40 = 815.32/x
  3. Step 3: Cross multiply
    1,163.88x = 1,744.40 × 815.32
  4. Step 4: Simplify right side
    1,163.88x = 1,422,244.21
  5. Step 5: Solve for x
    x = 1,422,244.21/1,163.88
  6. Step 6: Final answer
    x = 1,221.99

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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.