Home / 13,137.38-18,129.72-7,169.12

Finding the Fourth Proportional to 13,137.38, 18,129.72 and 7,169.12

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Solution

The fourth proportional to 13,137.38, 18,129.72 and 7,169.12 is: 9,893.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.38 : 18,129.72 = 7,169.12 : x
  2. Step 2: Convert to fraction form
    13,137.38/18,129.72 = 7,169.12/x
  3. Step 3: Cross multiply
    13,137.38x = 18,129.72 × 7,169.12
  4. Step 4: Simplify right side
    13,137.38x = 129,974,138.25
  5. Step 5: Solve for x
    x = 129,974,138.25/13,137.38
  6. Step 6: Final answer
    x = 9,893.46

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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.