Home / 81,143.22-121,536.81-66,943.50

Finding the Fourth Proportional to 81,143.22, 121,536.81 and 66,943.50

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Solution

The fourth proportional to 81,143.22, 121,536.81 and 66,943.50 is: 100,268.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,143.22 : 121,536.81 = 66,943.50 : x
  2. Step 2: Convert to fraction form
    81,143.22/121,536.81 = 66,943.50/x
  3. Step 3: Cross multiply
    81,143.22x = 121,536.81 × 66,943.50
  4. Step 4: Simplify right side
    81,143.22x = 8,136,099,440.24
  5. Step 5: Solve for x
    x = 8,136,099,440.24/81,143.22
  6. Step 6: Final answer
    x = 100,268.38

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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.