Home / 20,381.58-28,122.68-12,313.61

Finding the Fourth Proportional to 20,381.58, 28,122.68 and 12,313.61

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Solution

The fourth proportional to 20,381.58, 28,122.68 and 12,313.61 is: 16,990.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.58 : 28,122.68 = 12,313.61 : x
  2. Step 2: Convert to fraction form
    20,381.58/28,122.68 = 12,313.61/x
  3. Step 3: Cross multiply
    20,381.58x = 28,122.68 × 12,313.61
  4. Step 4: Simplify right side
    20,381.58x = 346,291,511.49
  5. Step 5: Solve for x
    x = 346,291,511.49/20,381.58
  6. Step 6: Final answer
    x = 16,990.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.