Home / 21,388.20-32,039.10-12,143.40

Finding the Fourth Proportional to 21,388.20, 32,039.10 and 12,143.40

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Solution

The fourth proportional to 21,388.20, 32,039.10 and 12,143.40 is: 18,190.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,388.20 : 32,039.10 = 12,143.40 : x
  2. Step 2: Convert to fraction form
    21,388.20/32,039.10 = 12,143.40/x
  3. Step 3: Cross multiply
    21,388.20x = 32,039.10 × 12,143.40
  4. Step 4: Simplify right side
    21,388.20x = 389,063,606.94
  5. Step 5: Solve for x
    x = 389,063,606.94/21,388.20
  6. Step 6: Final answer
    x = 18,190.57

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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.