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Finding the Fourth Proportional to 20,951.19, 28,911.60 and 11,520.09

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Solution

The fourth proportional to 20,951.19, 28,911.60 and 11,520.09 is: 15,897.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.19 : 28,911.60 = 11,520.09 : x
  2. Step 2: Convert to fraction form
    20,951.19/28,911.60 = 11,520.09/x
  3. Step 3: Cross multiply
    20,951.19x = 28,911.60 × 11,520.09
  4. Step 4: Simplify right side
    20,951.19x = 333,064,234.04
  5. Step 5: Solve for x
    x = 333,064,234.04/20,951.19
  6. Step 6: Final answer
    x = 15,897.15

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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.