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Finding the Fourth Proportional to 1,128.87, 1,693.62 and 696.33

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Solution

The fourth proportional to 1,128.87, 1,693.62 and 696.33 is: 1,044.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.87 : 1,693.62 = 696.33 : x
  2. Step 2: Convert to fraction form
    1,128.87/1,693.62 = 696.33/x
  3. Step 3: Cross multiply
    1,128.87x = 1,693.62 × 696.33
  4. Step 4: Simplify right side
    1,128.87x = 1,179,318.41
  5. Step 5: Solve for x
    x = 1,179,318.41/1,128.87
  6. Step 6: Final answer
    x = 1,044.69

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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.