Home / 80,739.10-121,069.77-28,147.42

Finding the Fourth Proportional to 80,739.10, 121,069.77 and 28,147.42

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Solution

The fourth proportional to 80,739.10, 121,069.77 and 28,147.42 is: 42,207.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,739.10 : 121,069.77 = 28,147.42 : x
  2. Step 2: Convert to fraction form
    80,739.10/121,069.77 = 28,147.42/x
  3. Step 3: Cross multiply
    80,739.10x = 121,069.77 × 28,147.42
  4. Step 4: Simplify right side
    80,739.10x = 3,407,801,665.49
  5. Step 5: Solve for x
    x = 3,407,801,665.49/80,739.10
  6. Step 6: Final answer
    x = 42,207.58

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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.