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Finding the Fourth Proportional to 13,759.40, 18,989.03 and 7,791.98

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Solution

The fourth proportional to 13,759.40, 18,989.03 and 7,791.98 is: 10,753.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,759.40 : 18,989.03 = 7,791.98 : x
  2. Step 2: Convert to fraction form
    13,759.40/18,989.03 = 7,791.98/x
  3. Step 3: Cross multiply
    13,759.40x = 18,989.03 × 7,791.98
  4. Step 4: Simplify right side
    13,759.40x = 147,962,066.51
  5. Step 5: Solve for x
    x = 147,962,066.51/13,759.40
  6. Step 6: Final answer
    x = 10,753.52

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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.