Home / 20,970.14-28,939.25-11,538.70

Finding the Fourth Proportional to 20,970.14, 28,939.25 and 11,538.70

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Solution

The fourth proportional to 20,970.14, 28,939.25 and 11,538.70 is: 15,923.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.14 : 28,939.25 = 11,538.70 : x
  2. Step 2: Convert to fraction form
    20,970.14/28,939.25 = 11,538.70/x
  3. Step 3: Cross multiply
    20,970.14x = 28,939.25 × 11,538.70
  4. Step 4: Simplify right side
    20,970.14x = 333,921,410.80
  5. Step 5: Solve for x
    x = 333,921,410.80/20,970.14
  6. Step 6: Final answer
    x = 15,923.66

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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.