Home / 21,009.31-28,993.46-11,578.48

Finding the Fourth Proportional to 21,009.31, 28,993.46 and 11,578.48

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Solution

The fourth proportional to 21,009.31, 28,993.46 and 11,578.48 is: 15,978.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.31 : 28,993.46 = 11,578.48 : x
  2. Step 2: Convert to fraction form
    21,009.31/28,993.46 = 11,578.48/x
  3. Step 3: Cross multiply
    21,009.31x = 28,993.46 × 11,578.48
  4. Step 4: Simplify right side
    21,009.31x = 335,700,269.22
  5. Step 5: Solve for x
    x = 335,700,269.22/21,009.31
  6. Step 6: Final answer
    x = 15,978.64

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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.