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Finding the Fourth Proportional to 21,009.82, 28,994.16 and 11,578.99

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Solution

The fourth proportional to 21,009.82, 28,994.16 and 11,578.99 is: 15,979.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.82 : 28,994.16 = 11,578.99 : x
  2. Step 2: Convert to fraction form
    21,009.82/28,994.16 = 11,578.99/x
  3. Step 3: Cross multiply
    21,009.82x = 28,994.16 × 11,578.99
  4. Step 4: Simplify right side
    21,009.82x = 335,723,088.70
  5. Step 5: Solve for x
    x = 335,723,088.70/21,009.82
  6. Step 6: Final answer
    x = 15,979.34

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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.