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Finding the Fourth Proportional to 20,889.84, 28,817.88 and 15,221.88

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Solution

The fourth proportional to 20,889.84, 28,817.88 and 15,221.88 is: 20,998.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.84 : 28,817.88 = 15,221.88 : x
  2. Step 2: Convert to fraction form
    20,889.84/28,817.88 = 15,221.88/x
  3. Step 3: Cross multiply
    20,889.84x = 28,817.88 × 15,221.88
  4. Step 4: Simplify right side
    20,889.84x = 438,662,311.21
  5. Step 5: Solve for x
    x = 438,662,311.21/20,889.84
  6. Step 6: Final answer
    x = 20,998.84

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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.