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Finding the Fourth Proportional to 20,489.95, 30,742.31 and 8,018.92

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Solution

The fourth proportional to 20,489.95, 30,742.31 and 8,018.92 is: 12,031.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.95 : 30,742.31 = 8,018.92 : x
  2. Step 2: Convert to fraction form
    20,489.95/30,742.31 = 8,018.92/x
  3. Step 3: Cross multiply
    20,489.95x = 30,742.31 × 8,018.92
  4. Step 4: Simplify right side
    20,489.95x = 246,520,124.51
  5. Step 5: Solve for x
    x = 246,520,124.51/20,489.95
  6. Step 6: Final answer
    x = 12,031.27

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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.