Home / 20,820.26-28,731.35-11,388.62

Finding the Fourth Proportional to 20,820.26, 28,731.35 and 11,388.62

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Solution

The fourth proportional to 20,820.26, 28,731.35 and 11,388.62 is: 15,715.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.26 : 28,731.35 = 11,388.62 : x
  2. Step 2: Convert to fraction form
    20,820.26/28,731.35 = 11,388.62/x
  3. Step 3: Cross multiply
    20,820.26x = 28,731.35 × 11,388.62
  4. Step 4: Simplify right side
    20,820.26x = 327,210,427.24
  5. Step 5: Solve for x
    x = 327,210,427.24/20,820.26
  6. Step 6: Final answer
    x = 15,715.96

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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.