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Finding the Fourth Proportional to 81,743, 121,899.17 and 80,995.64

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Solution

The fourth proportional to 81,743, 121,899.17 and 80,995.64 is: 120,784.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,743 : 121,899.17 = 80,995.64 : x
  2. Step 2: Convert to fraction form
    81,743/121,899.17 = 80,995.64/x
  3. Step 3: Cross multiply
    81,743x = 121,899.17 × 80,995.64
  4. Step 4: Simplify right side
    81,743x = 9,873,301,289.62
  5. Step 5: Solve for x
    x = 9,873,301,289.62/81,743
  6. Step 6: Final answer
    x = 120,784.67

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1.5x scale

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.