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Finding the Fourth Proportional to 81,079.58, 121,421.72 and 45,912.62

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Solution

The fourth proportional to 81,079.58, 121,421.72 and 45,912.62 is: 68,757.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,079.58 : 121,421.72 = 45,912.62 : x
  2. Step 2: Convert to fraction form
    81,079.58/121,421.72 = 45,912.62/x
  3. Step 3: Cross multiply
    81,079.58x = 121,421.72 × 45,912.62
  4. Step 4: Simplify right side
    81,079.58x = 5,574,789,290.11
  5. Step 5: Solve for x
    x = 5,574,789,290.11/81,079.58
  6. Step 6: Final answer
    x = 68,757.01

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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.