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Finding the Fourth Proportional to 21,008.87, 28,991.91 and 11,577.77

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Solution

The fourth proportional to 21,008.87, 28,991.91 and 11,577.77 is: 15,977.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.87 : 28,991.91 = 11,577.77 : x
  2. Step 2: Convert to fraction form
    21,008.87/28,991.91 = 11,577.77/x
  3. Step 3: Cross multiply
    21,008.87x = 28,991.91 × 11,577.77
  4. Step 4: Simplify right side
    21,008.87x = 335,661,665.84
  5. Step 5: Solve for x
    x = 335,661,665.84/21,008.87
  6. Step 6: Final answer
    x = 15,977.14

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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.