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Finding the Fourth Proportional to 21,897.76, 30,218.94 and 11,961.76

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Solution

The fourth proportional to 21,897.76, 30,218.94 and 11,961.76 is: 16,507.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,897.76 : 30,218.94 = 11,961.76 : x
  2. Step 2: Convert to fraction form
    21,897.76/30,218.94 = 11,961.76/x
  3. Step 3: Cross multiply
    21,897.76x = 30,218.94 × 11,961.76
  4. Step 4: Simplify right side
    21,897.76x = 361,471,707.73
  5. Step 5: Solve for x
    x = 361,471,707.73/21,897.76
  6. Step 6: Final answer
    x = 16,507.25

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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.