Home / 13,143.40-18,138.12-7,175.12

Finding the Fourth Proportional to 13,143.40, 18,138.12 and 7,175.12

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Solution

The fourth proportional to 13,143.40, 18,138.12 and 7,175.12 is: 9,901.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.40 : 18,138.12 = 7,175.12 : x
  2. Step 2: Convert to fraction form
    13,143.40/18,138.12 = 7,175.12/x
  3. Step 3: Cross multiply
    13,143.40x = 18,138.12 × 7,175.12
  4. Step 4: Simplify right side
    13,143.40x = 130,143,187.57
  5. Step 5: Solve for x
    x = 130,143,187.57/13,143.40
  6. Step 6: Final answer
    x = 9,901.79

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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.