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Finding the Fourth Proportional to 1,129.10, 1,690.89 and 799.22

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Solution

The fourth proportional to 1,129.10, 1,690.89 and 799.22 is: 1,196.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.10 : 1,690.89 = 799.22 : x
  2. Step 2: Convert to fraction form
    1,129.10/1,690.89 = 799.22/x
  3. Step 3: Cross multiply
    1,129.10x = 1,690.89 × 799.22
  4. Step 4: Simplify right side
    1,129.10x = 1,351,384.65
  5. Step 5: Solve for x
    x = 1,351,384.65/1,129.10
  6. Step 6: Final answer
    x = 1,196.87

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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.