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Finding the Fourth Proportional to 1,338.35, 2,007.66 and 688.82

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Solution

The fourth proportional to 1,338.35, 2,007.66 and 688.82 is: 1,033.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.35 : 2,007.66 = 688.82 : x
  2. Step 2: Convert to fraction form
    1,338.35/2,007.66 = 688.82/x
  3. Step 3: Cross multiply
    1,338.35x = 2,007.66 × 688.82
  4. Step 4: Simplify right side
    1,338.35x = 1,382,916.36
  5. Step 5: Solve for x
    x = 1,382,916.36/1,338.35
  6. Step 6: Final answer
    x = 1,033.30

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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.