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Finding the Fourth Proportional to 20,802.70, 28,700.72 and 11,843.87

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Solution

The fourth proportional to 20,802.70, 28,700.72 and 11,843.87 is: 16,340.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,802.70 : 28,700.72 = 11,843.87 : x
  2. Step 2: Convert to fraction form
    20,802.70/28,700.72 = 11,843.87/x
  3. Step 3: Cross multiply
    20,802.70x = 28,700.72 × 11,843.87
  4. Step 4: Simplify right side
    20,802.70x = 339,927,453.08
  5. Step 5: Solve for x
    x = 339,927,453.08/20,802.70
  6. Step 6: Final answer
    x = 16,340.54

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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.