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Finding the Fourth Proportional to 28,221.56, 38,928.14 and 18,163.12

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Solution

The fourth proportional to 28,221.56, 38,928.14 and 18,163.12 is: 25,053.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,221.56 : 38,928.14 = 18,163.12 : x
  2. Step 2: Convert to fraction form
    28,221.56/38,928.14 = 18,163.12/x
  3. Step 3: Cross multiply
    28,221.56x = 38,928.14 × 18,163.12
  4. Step 4: Simplify right side
    28,221.56x = 707,056,478.20
  5. Step 5: Solve for x
    x = 707,056,478.20/28,221.56
  6. Step 6: Final answer
    x = 25,053.77

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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.