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Finding the Fourth Proportional to 13,172.20, 19,736.70 and 11,228.20

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Solution

The fourth proportional to 13,172.20, 19,736.70 and 11,228.20 is: 16,823.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,172.20 : 19,736.70 = 11,228.20 : x
  2. Step 2: Convert to fraction form
    13,172.20/19,736.70 = 11,228.20/x
  3. Step 3: Cross multiply
    13,172.20x = 19,736.70 × 11,228.20
  4. Step 4: Simplify right side
    13,172.20x = 221,607,614.94
  5. Step 5: Solve for x
    x = 221,607,614.94/13,172.20
  6. Step 6: Final answer
    x = 16,823.89

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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.