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Finding the Fourth Proportional to 20,273.19, 27,978.09 and 11,320.86

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Solution

The fourth proportional to 20,273.19, 27,978.09 and 11,320.86 is: 15,623.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,273.19 : 27,978.09 = 11,320.86 : x
  2. Step 2: Convert to fraction form
    20,273.19/27,978.09 = 11,320.86/x
  3. Step 3: Cross multiply
    20,273.19x = 27,978.09 × 11,320.86
  4. Step 4: Simplify right side
    20,273.19x = 316,736,039.96
  5. Step 5: Solve for x
    x = 316,736,039.96/20,273.19
  6. Step 6: Final answer
    x = 15,623.39

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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.