Home / 20,396.90-28,147.75-11,904.86

Finding the Fourth Proportional to 20,396.90, 28,147.75 and 11,904.86

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Solution

The fourth proportional to 20,396.90, 28,147.75 and 11,904.86 is: 16,428.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,396.90 : 28,147.75 = 11,904.86 : x
  2. Step 2: Convert to fraction form
    20,396.90/28,147.75 = 11,904.86/x
  3. Step 3: Cross multiply
    20,396.90x = 28,147.75 × 11,904.86
  4. Step 4: Simplify right side
    20,396.90x = 335,095,063.67
  5. Step 5: Solve for x
    x = 335,095,063.67/20,396.90
  6. Step 6: Final answer
    x = 16,428.72

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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.