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Finding the Fourth Proportional to 13,759.49, 18,987.52 and 7,791.49

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Solution

The fourth proportional to 13,759.49, 18,987.52 and 7,791.49 is: 10,751.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,759.49 : 18,987.52 = 7,791.49 : x
  2. Step 2: Convert to fraction form
    13,759.49/18,987.52 = 7,791.49/x
  3. Step 3: Cross multiply
    13,759.49x = 18,987.52 × 7,791.49
  4. Step 4: Simplify right side
    13,759.49x = 147,940,938.31
  5. Step 5: Solve for x
    x = 147,940,938.31/13,759.49
  6. Step 6: Final answer
    x = 10,751.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.