Home / 20,901.65-31,357.94-12,128.13

Finding the Fourth Proportional to 20,901.65, 31,357.94 and 12,128.13

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Solution

The fourth proportional to 20,901.65, 31,357.94 and 12,128.13 is: 18,195.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,901.65 : 31,357.94 = 12,128.13 : x
  2. Step 2: Convert to fraction form
    20,901.65/31,357.94 = 12,128.13/x
  3. Step 3: Cross multiply
    20,901.65x = 31,357.94 × 12,128.13
  4. Step 4: Simplify right side
    20,901.65x = 380,313,112.21
  5. Step 5: Solve for x
    x = 380,313,112.21/20,901.65
  6. Step 6: Final answer
    x = 18,195.37

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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.