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Finding the Fourth Proportional to 21,507.80, 29,679.90 and 12,076.16

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Solution

The fourth proportional to 21,507.80, 29,679.90 and 12,076.16 is: 16,664.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,507.80 : 29,679.90 = 12,076.16 : x
  2. Step 2: Convert to fraction form
    21,507.80/29,679.90 = 12,076.16/x
  3. Step 3: Cross multiply
    21,507.80x = 29,679.90 × 12,076.16
  4. Step 4: Simplify right side
    21,507.80x = 358,419,221.18
  5. Step 5: Solve for x
    x = 358,419,221.18/21,507.80
  6. Step 6: Final answer
    x = 16,664.62

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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.