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Finding the Fourth Proportional to 21,905.76, 30,231.12 and 11,969.76

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Solution

The fourth proportional to 21,905.76, 30,231.12 and 11,969.76 is: 16,518.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,905.76 : 30,231.12 = 11,969.76 : x
  2. Step 2: Convert to fraction form
    21,905.76/30,231.12 = 11,969.76/x
  3. Step 3: Cross multiply
    21,905.76x = 30,231.12 × 11,969.76
  4. Step 4: Simplify right side
    21,905.76x = 361,859,250.93
  5. Step 5: Solve for x
    x = 361,859,250.93/21,905.76
  6. Step 6: Final answer
    x = 16,518.91

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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.