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Finding the Fourth Proportional to 21,009.50, 28,992.73 and 11,449.47

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Solution

The fourth proportional to 21,009.50, 28,992.73 and 11,449.47 is: 15,800.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.50 : 28,992.73 = 11,449.47 : x
  2. Step 2: Convert to fraction form
    21,009.50/28,992.73 = 11,449.47/x
  3. Step 3: Cross multiply
    21,009.50x = 28,992.73 × 11,449.47
  4. Step 4: Simplify right side
    21,009.50x = 331,951,190.14
  5. Step 5: Solve for x
    x = 331,951,190.14/21,009.50
  6. Step 6: Final answer
    x = 15,800.06

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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.