Home / 20,561.72-28,375.18-11,130.28

Finding the Fourth Proportional to 20,561.72, 28,375.18 and 11,130.28

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Solution

The fourth proportional to 20,561.72, 28,375.18 and 11,130.28 is: 15,359.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.72 : 28,375.18 = 11,130.28 : x
  2. Step 2: Convert to fraction form
    20,561.72/28,375.18 = 11,130.28/x
  3. Step 3: Cross multiply
    20,561.72x = 28,375.18 × 11,130.28
  4. Step 4: Simplify right side
    20,561.72x = 315,823,599.69
  5. Step 5: Solve for x
    x = 315,823,599.69/20,561.72
  6. Step 6: Final answer
    x = 15,359.79

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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.