Home / 81,039.72-121,559.40-21,881.28

Finding the Fourth Proportional to 81,039.72, 121,559.40 and 21,881.28

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Solution

The fourth proportional to 81,039.72, 121,559.40 and 21,881.28 is: 32,821.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,039.72 : 121,559.40 = 21,881.28 : x
  2. Step 2: Convert to fraction form
    81,039.72/121,559.40 = 21,881.28/x
  3. Step 3: Cross multiply
    81,039.72x = 121,559.40 × 21,881.28
  4. Step 4: Simplify right side
    81,039.72x = 2,659,875,268.03
  5. Step 5: Solve for x
    x = 2,659,875,268.03/81,039.72
  6. Step 6: Final answer
    x = 32,821.87

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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.