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Finding the Fourth Proportional to 21,008.93, 28,991.96 and 11,448.90

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Solution

The fourth proportional to 21,008.93, 28,991.96 and 11,448.90 is: 15,799.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.93 : 28,991.96 = 11,448.90 : x
  2. Step 2: Convert to fraction form
    21,008.93/28,991.96 = 11,448.90/x
  3. Step 3: Cross multiply
    21,008.93x = 28,991.96 × 11,448.90
  4. Step 4: Simplify right side
    21,008.93x = 331,926,102.32
  5. Step 5: Solve for x
    x = 331,926,102.32/21,008.93
  6. Step 6: Final answer
    x = 15,799.28

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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.