Home / 81,390.84-121,940.46-28,766.76

Finding the Fourth Proportional to 81,390.84, 121,940.46 and 28,766.76

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Solution

The fourth proportional to 81,390.84, 121,940.46 and 28,766.76 is: 43,098.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.84 : 121,940.46 = 28,766.76 : x
  2. Step 2: Convert to fraction form
    81,390.84/121,940.46 = 28,766.76/x
  3. Step 3: Cross multiply
    81,390.84x = 121,940.46 × 28,766.76
  4. Step 4: Simplify right side
    81,390.84x = 3,507,831,947.11
  5. Step 5: Solve for x
    x = 3,507,831,947.11/81,390.84
  6. Step 6: Final answer
    x = 43,098.61

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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.