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Finding the Fourth Proportional to 1,129.58, 1,690.83 and 758.66

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Solution

The fourth proportional to 1,129.58, 1,690.83 and 758.66 is: 1,135.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.58 : 1,690.83 = 758.66 : x
  2. Step 2: Convert to fraction form
    1,129.58/1,690.83 = 758.66/x
  3. Step 3: Cross multiply
    1,129.58x = 1,690.83 × 758.66
  4. Step 4: Simplify right side
    1,129.58x = 1,282,765.09
  5. Step 5: Solve for x
    x = 1,282,765.09/1,129.58
  6. Step 6: Final answer
    x = 1,135.61

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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.