Home / 81,408.11-121,964.54-79,636.64

Finding the Fourth Proportional to 81,408.11, 121,964.54 and 79,636.64

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Solution

The fourth proportional to 81,408.11, 121,964.54 and 79,636.64 is: 119,310.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,408.11 : 121,964.54 = 79,636.64 : x
  2. Step 2: Convert to fraction form
    81,408.11/121,964.54 = 79,636.64/x
  3. Step 3: Cross multiply
    81,408.11x = 121,964.54 × 79,636.64
  4. Step 4: Simplify right side
    81,408.11x = 9,712,846,164.75
  5. Step 5: Solve for x
    x = 9,712,846,164.75/81,408.11
  6. Step 6: Final answer
    x = 119,310.55

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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.