Home / 13,138.77-18,131.91-7,474.34

Finding the Fourth Proportional to 13,138.77, 18,131.91 and 7,474.34

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Solution

The fourth proportional to 13,138.77, 18,131.91 and 7,474.34 is: 10,314.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.77 : 18,131.91 = 7,474.34 : x
  2. Step 2: Convert to fraction form
    13,138.77/18,131.91 = 7,474.34/x
  3. Step 3: Cross multiply
    13,138.77x = 18,131.91 × 7,474.34
  4. Step 4: Simplify right side
    13,138.77x = 135,524,077.49
  5. Step 5: Solve for x
    x = 135,524,077.49/13,138.77
  6. Step 6: Final answer
    x = 10,314.82

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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.