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Finding the Fourth Proportional to 21,008.77, 28,991.84 and 11,449.08

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Solution

The fourth proportional to 21,008.77, 28,991.84 and 11,449.08 is: 15,799.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.77 : 28,991.84 = 11,449.08 : x
  2. Step 2: Convert to fraction form
    21,008.77/28,991.84 = 11,449.08/x
  3. Step 3: Cross multiply
    21,008.77x = 28,991.84 × 11,449.08
  4. Step 4: Simplify right side
    21,008.77x = 331,929,693.30
  5. Step 5: Solve for x
    x = 331,929,693.30/21,008.77
  6. Step 6: Final answer
    x = 15,799.58

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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.