Home / 13,138.62-18,131.40-7,170.34

Finding the Fourth Proportional to 13,138.62, 18,131.40 and 7,170.34

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Solution

The fourth proportional to 13,138.62, 18,131.40 and 7,170.34 is: 9,895.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.62 : 18,131.40 = 7,170.34 : x
  2. Step 2: Convert to fraction form
    13,138.62/18,131.40 = 7,170.34/x
  3. Step 3: Cross multiply
    13,138.62x = 18,131.40 × 7,170.34
  4. Step 4: Simplify right side
    13,138.62x = 130,008,302.68
  5. Step 5: Solve for x
    x = 130,008,302.68/13,138.62
  6. Step 6: Final answer
    x = 9,895.13

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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.