Home / 81,388.33-121,528.49-71,820.81

Finding the Fourth Proportional to 81,388.33, 121,528.49 and 71,820.81

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Solution

The fourth proportional to 81,388.33, 121,528.49 and 71,820.81 is: 107,242.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,388.33 : 121,528.49 = 71,820.81 : x
  2. Step 2: Convert to fraction form
    81,388.33/121,528.49 = 71,820.81/x
  3. Step 3: Cross multiply
    81,388.33x = 121,528.49 × 71,820.81
  4. Step 4: Simplify right side
    81,388.33x = 8,728,274,230.77
  5. Step 5: Solve for x
    x = 8,728,274,230.77/81,388.33
  6. Step 6: Final answer
    x = 107,242.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.