Home / 13,139.54-18,140.01-9,112.22

Finding the Fourth Proportional to 13,139.54, 18,140.01 and 9,112.22

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Solution

The fourth proportional to 13,139.54, 18,140.01 and 9,112.22 is: 12,580.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.54 : 18,140.01 = 9,112.22 : x
  2. Step 2: Convert to fraction form
    13,139.54/18,140.01 = 9,112.22/x
  3. Step 3: Cross multiply
    13,139.54x = 18,140.01 × 9,112.22
  4. Step 4: Simplify right side
    13,139.54x = 165,295,761.92
  5. Step 5: Solve for x
    x = 165,295,761.92/13,139.54
  6. Step 6: Final answer
    x = 12,580.03

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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.