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Finding the Fourth Proportional to 28,234.80, 38,965.44 and 15,659.76

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Solution

The fourth proportional to 28,234.80, 38,965.44 and 15,659.76 is: 21,611.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,234.80 : 38,965.44 = 15,659.76 : x
  2. Step 2: Convert to fraction form
    28,234.80/38,965.44 = 15,659.76/x
  3. Step 3: Cross multiply
    28,234.80x = 38,965.44 × 15,659.76
  4. Step 4: Simplify right side
    28,234.80x = 610,189,438.69
  5. Step 5: Solve for x
    x = 610,189,438.69/28,234.80
  6. Step 6: Final answer
    x = 21,611.25

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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.