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Finding the Fourth Proportional to 1,338.43, 2,006.93 and 679.90

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Solution

The fourth proportional to 1,338.43, 2,006.93 and 679.90 is: 1,019.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.43 : 2,006.93 = 679.90 : x
  2. Step 2: Convert to fraction form
    1,338.43/2,006.93 = 679.90/x
  3. Step 3: Cross multiply
    1,338.43x = 2,006.93 × 679.90
  4. Step 4: Simplify right side
    1,338.43x = 1,364,511.71
  5. Step 5: Solve for x
    x = 1,364,511.71/1,338.43
  6. Step 6: Final answer
    x = 1,019.49

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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.