Home / 20,917.71-28,864.65-11,963.78

Finding the Fourth Proportional to 20,917.71, 28,864.65 and 11,963.78

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Solution

The fourth proportional to 20,917.71, 28,864.65 and 11,963.78 is: 16,508.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.71 : 28,864.65 = 11,963.78 : x
  2. Step 2: Convert to fraction form
    20,917.71/28,864.65 = 11,963.78/x
  3. Step 3: Cross multiply
    20,917.71x = 28,864.65 × 11,963.78
  4. Step 4: Simplify right side
    20,917.71x = 345,330,178.05
  5. Step 5: Solve for x
    x = 345,330,178.05/20,917.71
  6. Step 6: Final answer
    x = 16,508.99

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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.