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Finding the Fourth Proportional to 20,676, 28,533.18 and 15,492.70

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Solution

The fourth proportional to 20,676, 28,533.18 and 15,492.70 is: 21,380.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,676 : 28,533.18 = 15,492.70 : x
  2. Step 2: Convert to fraction form
    20,676/28,533.18 = 15,492.70/x
  3. Step 3: Cross multiply
    20,676x = 28,533.18 × 15,492.70
  4. Step 4: Simplify right side
    20,676x = 442,055,997.79
  5. Step 5: Solve for x
    x = 442,055,997.79/20,676
  6. Step 6: Final answer
    x = 21,380.15

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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.