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Finding the Fourth Proportional to 13,759.99, 18,988.20 and 7,791.99

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Solution

The fourth proportional to 13,759.99, 18,988.20 and 7,791.99 is: 10,752.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,759.99 : 18,988.20 = 7,791.99 : x
  2. Step 2: Convert to fraction form
    13,759.99/18,988.20 = 7,791.99/x
  3. Step 3: Cross multiply
    13,759.99x = 18,988.20 × 7,791.99
  4. Step 4: Simplify right side
    13,759.99x = 147,955,864.52
  5. Step 5: Solve for x
    x = 147,955,864.52/13,759.99
  6. Step 6: Final answer
    x = 10,752.61

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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.