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Finding the Fourth Proportional to 20,871.50, 28,801.08 and 11,917.78

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Solution

The fourth proportional to 20,871.50, 28,801.08 and 11,917.78 is: 16,445.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.50 : 28,801.08 = 11,917.78 : x
  2. Step 2: Convert to fraction form
    20,871.50/28,801.08 = 11,917.78/x
  3. Step 3: Cross multiply
    20,871.50x = 28,801.08 × 11,917.78
  4. Step 4: Simplify right side
    20,871.50x = 343,245,041.97
  5. Step 5: Solve for x
    x = 343,245,041.97/20,871.50
  6. Step 6: Final answer
    x = 16,445.64

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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.