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Finding the Fourth Proportional to 21,010.96, 28,993.96 and 11,578.80

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Solution

The fourth proportional to 21,010.96, 28,993.96 and 11,578.80 is: 15,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.96 : 28,993.96 = 11,578.80 : x
  2. Step 2: Convert to fraction form
    21,010.96/28,993.96 = 11,578.80/x
  3. Step 3: Cross multiply
    21,010.96x = 28,993.96 × 11,578.80
  4. Step 4: Simplify right side
    21,010.96x = 335,715,264.05
  5. Step 5: Solve for x
    x = 335,715,264.05/21,010.96
  6. Step 6: Final answer
    x = 15,978.10

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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.