Home / 20,946.50-28,906.22-11,515.13

Finding the Fourth Proportional to 20,946.50, 28,906.22 and 11,515.13

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Solution

The fourth proportional to 20,946.50, 28,906.22 and 11,515.13 is: 15,890.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,946.50 : 28,906.22 = 11,515.13 : x
  2. Step 2: Convert to fraction form
    20,946.50/28,906.22 = 11,515.13/x
  3. Step 3: Cross multiply
    20,946.50x = 28,906.22 × 11,515.13
  4. Step 4: Simplify right side
    20,946.50x = 332,858,881.11
  5. Step 5: Solve for x
    x = 332,858,881.11/20,946.50
  6. Step 6: Final answer
    x = 15,890.91

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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.