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Finding the Fourth Proportional to 1,338.75, 2,007.99 and 608.13

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Solution

The fourth proportional to 1,338.75, 2,007.99 and 608.13 is: 912.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.75 : 2,007.99 = 608.13 : x
  2. Step 2: Convert to fraction form
    1,338.75/2,007.99 = 608.13/x
  3. Step 3: Cross multiply
    1,338.75x = 2,007.99 × 608.13
  4. Step 4: Simplify right side
    1,338.75x = 1,221,118.96
  5. Step 5: Solve for x
    x = 1,221,118.96/1,338.75
  6. Step 6: Final answer
    x = 912.13

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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.