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Finding the Fourth Proportional to 21,008.25, 28,991 and 11,448.22

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Solution

The fourth proportional to 21,008.25, 28,991 and 11,448.22 is: 15,798.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.25 : 28,991 = 11,448.22 : x
  2. Step 2: Convert to fraction form
    21,008.25/28,991 = 11,448.22/x
  3. Step 3: Cross multiply
    21,008.25x = 28,991 × 11,448.22
  4. Step 4: Simplify right side
    21,008.25x = 331,895,346.02
  5. Step 5: Solve for x
    x = 331,895,346.02/21,008.25
  6. Step 6: Final answer
    x = 15,798.33

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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.