Home / 20,612.07-30,905.96-8,121.87

Finding the Fourth Proportional to 20,612.07, 30,905.96 and 8,121.87

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Solution

The fourth proportional to 20,612.07, 30,905.96 and 8,121.87 is: 12,178.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.07 : 30,905.96 = 8,121.87 : x
  2. Step 2: Convert to fraction form
    20,612.07/30,905.96 = 8,121.87/x
  3. Step 3: Cross multiply
    20,612.07x = 30,905.96 × 8,121.87
  4. Step 4: Simplify right side
    20,612.07x = 251,014,148.74
  5. Step 5: Solve for x
    x = 251,014,148.74/20,612.07
  6. Step 6: Final answer
    x = 12,178.02

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Why These Related Problems?

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