Home / 20,912.15-28,853.14-11,957.81

Finding the Fourth Proportional to 20,912.15, 28,853.14 and 11,957.81

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Solution

The fourth proportional to 20,912.15, 28,853.14 and 11,957.81 is: 16,498.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.15 : 28,853.14 = 11,957.81 : x
  2. Step 2: Convert to fraction form
    20,912.15/28,853.14 = 11,957.81/x
  3. Step 3: Cross multiply
    20,912.15x = 28,853.14 × 11,957.81
  4. Step 4: Simplify right side
    20,912.15x = 345,020,161.97
  5. Step 5: Solve for x
    x = 345,020,161.97/20,912.15
  6. Step 6: Final answer
    x = 16,498.55

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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.