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Finding the Fourth Proportional to 20,889.97, 28,827.76 and 11,815.17

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Solution

The fourth proportional to 20,889.97, 28,827.76 and 11,815.17 is: 16,304.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.97 : 28,827.76 = 11,815.17 : x
  2. Step 2: Convert to fraction form
    20,889.97/28,827.76 = 11,815.17/x
  3. Step 3: Cross multiply
    20,889.97x = 28,827.76 × 11,815.17
  4. Step 4: Simplify right side
    20,889.97x = 340,604,885.12
  5. Step 5: Solve for x
    x = 340,604,885.12/20,889.97
  6. Step 6: Final answer
    x = 16,304.71

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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.