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Finding the Fourth Proportional to 21,009.97, 28,993.70 and 11,578.53

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Solution

The fourth proportional to 21,009.97, 28,993.70 and 11,578.53 is: 15,978.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.97 : 28,993.70 = 11,578.53 : x
  2. Step 2: Convert to fraction form
    21,009.97/28,993.70 = 11,578.53/x
  3. Step 3: Cross multiply
    21,009.97x = 28,993.70 × 11,578.53
  4. Step 4: Simplify right side
    21,009.97x = 335,704,425.26
  5. Step 5: Solve for x
    x = 335,704,425.26/21,009.97
  6. Step 6: Final answer
    x = 15,978.34

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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.