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Finding the Fourth Proportional to 20,661, 31,103.92 and 18,823.92

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Solution

The fourth proportional to 20,661, 31,103.92 and 18,823.92 is: 28,338.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661 : 31,103.92 = 18,823.92 : x
  2. Step 2: Convert to fraction form
    20,661/31,103.92 = 18,823.92/x
  3. Step 3: Cross multiply
    20,661x = 31,103.92 × 18,823.92
  4. Step 4: Simplify right side
    20,661x = 585,497,701.77
  5. Step 5: Solve for x
    x = 585,497,701.77/20,661
  6. Step 6: Final answer
    x = 28,338.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.