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Finding the Fourth Proportional to 1,147.78, 1,720.30 and 799.23

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Solution

The fourth proportional to 1,147.78, 1,720.30 and 799.23 is: 1,197.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.78 : 1,720.30 = 799.23 : x
  2. Step 2: Convert to fraction form
    1,147.78/1,720.30 = 799.23/x
  3. Step 3: Cross multiply
    1,147.78x = 1,720.30 × 799.23
  4. Step 4: Simplify right side
    1,147.78x = 1,374,904.56
  5. Step 5: Solve for x
    x = 1,374,904.56/1,147.78
  6. Step 6: Final answer
    x = 1,197.88

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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.