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Finding the Fourth Proportional to 21,007.68, 28,996.29 and 12,059.88

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Solution

The fourth proportional to 21,007.68, 28,996.29 and 12,059.88 is: 16,645.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.68 : 28,996.29 = 12,059.88 : x
  2. Step 2: Convert to fraction form
    21,007.68/28,996.29 = 12,059.88/x
  3. Step 3: Cross multiply
    21,007.68x = 28,996.29 × 12,059.88
  4. Step 4: Simplify right side
    21,007.68x = 349,691,777.85
  5. Step 5: Solve for x
    x = 349,691,777.85/21,007.68
  6. Step 6: Final answer
    x = 16,645.90

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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.