Home / 20,970.27-28,939.92-13,015.05

Finding the Fourth Proportional to 20,970.27, 28,939.92 and 13,015.05

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Solution

The fourth proportional to 20,970.27, 28,939.92 and 13,015.05 is: 17,961.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.27 : 28,939.92 = 13,015.05 : x
  2. Step 2: Convert to fraction form
    20,970.27/28,939.92 = 13,015.05/x
  3. Step 3: Cross multiply
    20,970.27x = 28,939.92 × 13,015.05
  4. Step 4: Simplify right side
    20,970.27x = 376,654,505.80
  5. Step 5: Solve for x
    x = 376,654,505.80/20,970.27
  6. Step 6: Final answer
    x = 17,961.36

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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.