Home / 81,120.86-121,516.05-66,181.22

Finding the Fourth Proportional to 81,120.86, 121,516.05 and 66,181.22

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Solution

The fourth proportional to 81,120.86, 121,516.05 and 66,181.22 is: 99,137.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,120.86 : 121,516.05 = 66,181.22 : x
  2. Step 2: Convert to fraction form
    81,120.86/121,516.05 = 66,181.22/x
  3. Step 3: Cross multiply
    81,120.86x = 121,516.05 × 66,181.22
  4. Step 4: Simplify right side
    81,120.86x = 8,042,080,494.19
  5. Step 5: Solve for x
    x = 8,042,080,494.19/81,120.86
  6. Step 6: Final answer
    x = 99,137.02

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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.