Home / 21,015.20-28,999.32-13,054.88

Finding the Fourth Proportional to 21,015.20, 28,999.32 and 13,054.88

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Solution

The fourth proportional to 21,015.20, 28,999.32 and 13,054.88 is: 18,014.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,015.20 : 28,999.32 = 13,054.88 : x
  2. Step 2: Convert to fraction form
    21,015.20/28,999.32 = 13,054.88/x
  3. Step 3: Cross multiply
    21,015.20x = 28,999.32 × 13,054.88
  4. Step 4: Simplify right side
    21,015.20x = 378,582,642.68
  5. Step 5: Solve for x
    x = 378,582,642.68/21,015.20
  6. Step 6: Final answer
    x = 18,014.71

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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.