Home / 81,142.72-121,536.06-66,943

Finding the Fourth Proportional to 81,142.72, 121,536.06 and 66,943

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Solution

The fourth proportional to 81,142.72, 121,536.06 and 66,943 is: 100,267.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,142.72 : 121,536.06 = 66,943 : x
  2. Step 2: Convert to fraction form
    81,142.72/121,536.06 = 66,943/x
  3. Step 3: Cross multiply
    81,142.72x = 121,536.06 × 66,943
  4. Step 4: Simplify right side
    81,142.72x = 8,135,988,464.58
  5. Step 5: Solve for x
    x = 8,135,988,464.58/81,142.72
  6. Step 6: Final answer
    x = 100,267.63

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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.