Home / 13,139.70-18,132.12-7,171.32

Finding the Fourth Proportional to 13,139.70, 18,132.12 and 7,171.32

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Solution

The fourth proportional to 13,139.70, 18,132.12 and 7,171.32 is: 9,896.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.70 : 18,132.12 = 7,171.32 : x
  2. Step 2: Convert to fraction form
    13,139.70/18,132.12 = 7,171.32/x
  3. Step 3: Cross multiply
    13,139.70x = 18,132.12 × 7,171.32
  4. Step 4: Simplify right side
    13,139.70x = 130,031,234.80
  5. Step 5: Solve for x
    x = 130,031,234.80/13,139.70
  6. Step 6: Final answer
    x = 9,896.06

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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.