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Finding the Fourth Proportional to 20,612.85, 30,897.81 and 15,672.12

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Solution

The fourth proportional to 20,612.85, 30,897.81 and 15,672.12 is: 23,491.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.85 : 30,897.81 = 15,672.12 : x
  2. Step 2: Convert to fraction form
    20,612.85/30,897.81 = 15,672.12/x
  3. Step 3: Cross multiply
    20,612.85x = 30,897.81 × 15,672.12
  4. Step 4: Simplify right side
    20,612.85x = 484,234,186.06
  5. Step 5: Solve for x
    x = 484,234,186.06/20,612.85
  6. Step 6: Final answer
    x = 23,491.86

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.