Home / 20,109.20-27,777.75-15,451.70

Finding the Fourth Proportional to 20,109.20, 27,777.75 and 15,451.70

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Solution

The fourth proportional to 20,109.20, 27,777.75 and 15,451.70 is: 21,344.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.20 : 27,777.75 = 15,451.70 : x
  2. Step 2: Convert to fraction form
    20,109.20/27,777.75 = 15,451.70/x
  3. Step 3: Cross multiply
    20,109.20x = 27,777.75 × 15,451.70
  4. Step 4: Simplify right side
    20,109.20x = 429,213,459.68
  5. Step 5: Solve for x
    x = 429,213,459.68/20,109.20
  6. Step 6: Final answer
    x = 21,344.13

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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.