Home / 21,009.60-28,993.36-11,578.72

Finding the Fourth Proportional to 21,009.60, 28,993.36 and 11,578.72

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Solution

The fourth proportional to 21,009.60, 28,993.36 and 11,578.72 is: 15,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.60 : 28,993.36 = 11,578.72 : x
  2. Step 2: Convert to fraction form
    21,009.60/28,993.36 = 11,578.72/x
  3. Step 3: Cross multiply
    21,009.60x = 28,993.36 × 11,578.72
  4. Step 4: Simplify right side
    21,009.60x = 335,705,997.30
  5. Step 5: Solve for x
    x = 335,705,997.30/21,009.60
  6. Step 6: Final answer
    x = 15,978.70

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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.