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Finding the Fourth Proportional to 21,009.68, 28,992.99 and 11,449.65

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Solution

The fourth proportional to 21,009.68, 28,992.99 and 11,449.65 is: 15,800.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.68 : 28,992.99 = 11,449.65 : x
  2. Step 2: Convert to fraction form
    21,009.68/28,992.99 = 11,449.65/x
  3. Step 3: Cross multiply
    21,009.68x = 28,992.99 × 11,449.65
  4. Step 4: Simplify right side
    21,009.68x = 331,959,696.68
  5. Step 5: Solve for x
    x = 331,959,696.68/21,009.68
  6. Step 6: Final answer
    x = 15,800.32

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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.