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Finding the Fourth Proportional to 19,721.60, 27,212.80 and 11,763.84

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Solution

The fourth proportional to 19,721.60, 27,212.80 and 11,763.84 is: 16,232.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,721.60 : 27,212.80 = 11,763.84 : x
  2. Step 2: Convert to fraction form
    19,721.60/27,212.80 = 11,763.84/x
  3. Step 3: Cross multiply
    19,721.60x = 27,212.80 × 11,763.84
  4. Step 4: Simplify right side
    19,721.60x = 320,127,025.15
  5. Step 5: Solve for x
    x = 320,127,025.15/19,721.60
  6. Step 6: Final answer
    x = 16,232.30

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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.