Home / 20,720.24-28,612.23-15,405.83

Finding the Fourth Proportional to 20,720.24, 28,612.23 and 15,405.83

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Solution

The fourth proportional to 20,720.24, 28,612.23 and 15,405.83 is: 21,273.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.24 : 28,612.23 = 15,405.83 : x
  2. Step 2: Convert to fraction form
    20,720.24/28,612.23 = 15,405.83/x
  3. Step 3: Cross multiply
    20,720.24x = 28,612.23 × 15,405.83
  4. Step 4: Simplify right side
    20,720.24x = 440,795,008.24
  5. Step 5: Solve for x
    x = 440,795,008.24/20,720.24
  6. Step 6: Final answer
    x = 21,273.65

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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.