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Finding the Fourth Proportional to 21,611.31, 29,823.21 and 12,179.88

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Solution

The fourth proportional to 21,611.31, 29,823.21 and 12,179.88 is: 16,808.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,611.31 : 29,823.21 = 12,179.88 : x
  2. Step 2: Convert to fraction form
    21,611.31/29,823.21 = 12,179.88/x
  3. Step 3: Cross multiply
    21,611.31x = 29,823.21 × 12,179.88
  4. Step 4: Simplify right side
    21,611.31x = 363,243,119.01
  5. Step 5: Solve for x
    x = 363,243,119.01/21,611.31
  6. Step 6: Final answer
    x = 16,808.01

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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.