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Finding the Fourth Proportional to 20,888.76, 28,822.50 and 11,939.10

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Solution

The fourth proportional to 20,888.76, 28,822.50 and 11,939.10 is: 16,473.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.76 : 28,822.50 = 11,939.10 : x
  2. Step 2: Convert to fraction form
    20,888.76/28,822.50 = 11,939.10/x
  3. Step 3: Cross multiply
    20,888.76x = 28,822.50 × 11,939.10
  4. Step 4: Simplify right side
    20,888.76x = 344,114,709.75
  5. Step 5: Solve for x
    x = 344,114,709.75/20,888.76
  6. Step 6: Final answer
    x = 16,473.68

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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.