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Finding the Fourth Proportional to 20,644.50, 28,491.40 and 11,571.40

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Solution

The fourth proportional to 20,644.50, 28,491.40 and 11,571.40 is: 15,969.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.50 : 28,491.40 = 11,571.40 : x
  2. Step 2: Convert to fraction form
    20,644.50/28,491.40 = 11,571.40/x
  3. Step 3: Cross multiply
    20,644.50x = 28,491.40 × 11,571.40
  4. Step 4: Simplify right side
    20,644.50x = 329,685,355.91
  5. Step 5: Solve for x
    x = 329,685,355.91/20,644.50
  6. Step 6: Final answer
    x = 15,969.65

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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.