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Finding the Fourth Proportional to 21,507.88, 29,680.90 and 12,076.46

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Solution

The fourth proportional to 21,507.88, 29,680.90 and 12,076.46 is: 16,665.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,507.88 : 29,680.90 = 12,076.46 : x
  2. Step 2: Convert to fraction form
    21,507.88/29,680.90 = 12,076.46/x
  3. Step 3: Cross multiply
    21,507.88x = 29,680.90 × 12,076.46
  4. Step 4: Simplify right side
    21,507.88x = 358,440,201.61
  5. Step 5: Solve for x
    x = 358,440,201.61/21,507.88
  6. Step 6: Final answer
    x = 16,665.53

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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.