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Finding the Fourth Proportional to 20,380.92, 30,571.44 and 8,686.68

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Solution

The fourth proportional to 20,380.92, 30,571.44 and 8,686.68 is: 13,030.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.92 : 30,571.44 = 8,686.68 : x
  2. Step 2: Convert to fraction form
    20,380.92/30,571.44 = 8,686.68/x
  3. Step 3: Cross multiply
    20,380.92x = 30,571.44 × 8,686.68
  4. Step 4: Simplify right side
    20,380.92x = 265,564,316.42
  5. Step 5: Solve for x
    x = 265,564,316.42/20,380.92
  6. Step 6: Final answer
    x = 13,030.05

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1.5x scale

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.