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Finding the Fourth Proportional to 21,009.38, 28,994.76 and 11,579.76

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Solution

The fourth proportional to 21,009.38, 28,994.76 and 11,579.76 is: 15,981.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.38 : 28,994.76 = 11,579.76 : x
  2. Step 2: Convert to fraction form
    21,009.38/28,994.76 = 11,579.76/x
  3. Step 3: Cross multiply
    21,009.38x = 28,994.76 × 11,579.76
  4. Step 4: Simplify right side
    21,009.38x = 335,752,362.06
  5. Step 5: Solve for x
    x = 335,752,362.06/21,009.38
  6. Step 6: Final answer
    x = 15,981.07

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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.