Home / 20,945.70-31,382.10-13,145.40

Finding the Fourth Proportional to 20,945.70, 31,382.10 and 13,145.40

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Solution

The fourth proportional to 20,945.70, 31,382.10 and 13,145.40 is: 19,695.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.70 : 31,382.10 = 13,145.40 : x
  2. Step 2: Convert to fraction form
    20,945.70/31,382.10 = 13,145.40/x
  3. Step 3: Cross multiply
    20,945.70x = 31,382.10 × 13,145.40
  4. Step 4: Simplify right side
    20,945.70x = 412,530,257.34
  5. Step 5: Solve for x
    x = 412,530,257.34/20,945.70
  6. Step 6: Final answer
    x = 19,695.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.