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Finding the Fourth Proportional to 21,008.68, 28,991.99 and 11,448.57

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Solution

The fourth proportional to 21,008.68, 28,991.99 and 11,448.57 is: 15,799.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.68 : 28,991.99 = 11,448.57 : x
  2. Step 2: Convert to fraction form
    21,008.68/28,991.99 = 11,448.57/x
  3. Step 3: Cross multiply
    21,008.68x = 28,991.99 × 11,448.57
  4. Step 4: Simplify right side
    21,008.68x = 331,916,826.95
  5. Step 5: Solve for x
    x = 331,916,826.95/21,008.68
  6. Step 6: Final answer
    x = 15,799.03

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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.