Home / 54,485.32-81,720.78-21,215.56

Finding the Fourth Proportional to 54,485.32, 81,720.78 and 21,215.56

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Solution

The fourth proportional to 54,485.32, 81,720.78 and 21,215.56 is: 31,820.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,485.32 : 81,720.78 = 21,215.56 : x
  2. Step 2: Convert to fraction form
    54,485.32/81,720.78 = 21,215.56/x
  3. Step 3: Cross multiply
    54,485.32x = 81,720.78 × 21,215.56
  4. Step 4: Simplify right side
    54,485.32x = 1,733,752,111.34
  5. Step 5: Solve for x
    x = 1,733,752,111.34/54,485.32
  6. Step 6: Final answer
    x = 31,820.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.