Home / 13,138.39-18,131.21-7,170.11

Finding the Fourth Proportional to 13,138.39, 18,131.21 and 7,170.11

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Solution

The fourth proportional to 13,138.39, 18,131.21 and 7,170.11 is: 9,894.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.39 : 18,131.21 = 7,170.11 : x
  2. Step 2: Convert to fraction form
    13,138.39/18,131.21 = 7,170.11/x
  3. Step 3: Cross multiply
    13,138.39x = 18,131.21 × 7,170.11
  4. Step 4: Simplify right side
    13,138.39x = 130,002,770.13
  5. Step 5: Solve for x
    x = 130,002,770.13/13,138.39
  6. Step 6: Final answer
    x = 9,894.88

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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.