Home / 20,571.16-28,388.15-11,139.72

Finding the Fourth Proportional to 20,571.16, 28,388.15 and 11,139.72

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Solution

The fourth proportional to 20,571.16, 28,388.15 and 11,139.72 is: 15,372.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571.16 : 28,388.15 = 11,139.72 : x
  2. Step 2: Convert to fraction form
    20,571.16/28,388.15 = 11,139.72/x
  3. Step 3: Cross multiply
    20,571.16x = 28,388.15 × 11,139.72
  4. Step 4: Simplify right side
    20,571.16x = 316,236,042.32
  5. Step 5: Solve for x
    x = 316,236,042.32/20,571.16
  6. Step 6: Final answer
    x = 15,372.79

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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.