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Finding the Fourth Proportional to 20,630.71, 30,920.08 and 11,251.21

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Solution

The fourth proportional to 20,630.71, 30,920.08 and 11,251.21 is: 16,862.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,630.71 : 30,920.08 = 11,251.21 : x
  2. Step 2: Convert to fraction form
    20,630.71/30,920.08 = 11,251.21/x
  3. Step 3: Cross multiply
    20,630.71x = 30,920.08 × 11,251.21
  4. Step 4: Simplify right side
    20,630.71x = 347,888,313.30
  5. Step 5: Solve for x
    x = 347,888,313.30/20,630.71
  6. Step 6: Final answer
    x = 16,862.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.