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Finding the Fourth Proportional to 20,703.56, 28,571.02 and 11,272.12

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Solution

The fourth proportional to 20,703.56, 28,571.02 and 11,272.12 is: 15,555.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,703.56 : 28,571.02 = 11,272.12 : x
  2. Step 2: Convert to fraction form
    20,703.56/28,571.02 = 11,272.12/x
  3. Step 3: Cross multiply
    20,703.56x = 28,571.02 × 11,272.12
  4. Step 4: Simplify right side
    20,703.56x = 322,055,965.96
  5. Step 5: Solve for x
    x = 322,055,965.96/20,703.56
  6. Step 6: Final answer
    x = 15,555.58

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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.