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Finding the Fourth Proportional to 21,900.25, 30,222.48 and 11,964.25

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Solution

The fourth proportional to 21,900.25, 30,222.48 and 11,964.25 is: 16,510.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,900.25 : 30,222.48 = 11,964.25 : x
  2. Step 2: Convert to fraction form
    21,900.25/30,222.48 = 11,964.25/x
  3. Step 3: Cross multiply
    21,900.25x = 30,222.48 × 11,964.25
  4. Step 4: Simplify right side
    21,900.25x = 361,589,306.34
  5. Step 5: Solve for x
    x = 361,589,306.34/21,900.25
  6. Step 6: Final answer
    x = 16,510.74

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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.