Home / 13,137.78-18,129.87-7,169.43

Finding the Fourth Proportional to 13,137.78, 18,129.87 and 7,169.43

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Solution

The fourth proportional to 13,137.78, 18,129.87 and 7,169.43 is: 9,893.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.78 : 18,129.87 = 7,169.43 : x
  2. Step 2: Convert to fraction form
    13,137.78/18,129.87 = 7,169.43/x
  3. Step 3: Cross multiply
    13,137.78x = 18,129.87 × 7,169.43
  4. Step 4: Simplify right side
    13,137.78x = 129,980,833.87
  5. Step 5: Solve for x
    x = 129,980,833.87/13,137.78
  6. Step 6: Final answer
    x = 9,893.67

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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.