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Finding the Fourth Proportional to 15,121.36, 20,861.84 and 11,152

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Solution

The fourth proportional to 15,121.36, 20,861.84 and 11,152 is: 15,385.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.36 : 20,861.84 = 11,152 : x
  2. Step 2: Convert to fraction form
    15,121.36/20,861.84 = 11,152/x
  3. Step 3: Cross multiply
    15,121.36x = 20,861.84 × 11,152
  4. Step 4: Simplify right side
    15,121.36x = 232,651,239.68
  5. Step 5: Solve for x
    x = 232,651,239.68/15,121.36
  6. Step 6: Final answer
    x = 15,385.60

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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.