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Finding the Fourth Proportional to 20,812.50, 28,711.22 and 13,639.32

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Solution

The fourth proportional to 20,812.50, 28,711.22 and 13,639.32 is: 18,815.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.50 : 28,711.22 = 13,639.32 : x
  2. Step 2: Convert to fraction form
    20,812.50/28,711.22 = 13,639.32/x
  3. Step 3: Cross multiply
    20,812.50x = 28,711.22 × 13,639.32
  4. Step 4: Simplify right side
    20,812.50x = 391,601,448.97
  5. Step 5: Solve for x
    x = 391,601,448.97/20,812.50
  6. Step 6: Final answer
    x = 18,815.69

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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.