Home / 20,890.28-28,832.28-12,397.09

Finding the Fourth Proportional to 20,890.28, 28,832.28 and 12,397.09

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Solution

The fourth proportional to 20,890.28, 28,832.28 and 12,397.09 is: 17,110.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.28 : 28,832.28 = 12,397.09 : x
  2. Step 2: Convert to fraction form
    20,890.28/28,832.28 = 12,397.09/x
  3. Step 3: Cross multiply
    20,890.28x = 28,832.28 × 12,397.09
  4. Step 4: Simplify right side
    20,890.28x = 357,436,163.92
  5. Step 5: Solve for x
    x = 357,436,163.92/20,890.28
  6. Step 6: Final answer
    x = 17,110.17

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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.