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Finding the Fourth Proportional to 81,404.90, 121,917.80 and 79,162.70

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Solution

The fourth proportional to 81,404.90, 121,917.80 and 79,162.70 is: 118,559.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,404.90 : 121,917.80 = 79,162.70 : x
  2. Step 2: Convert to fraction form
    81,404.90/121,917.80 = 79,162.70/x
  3. Step 3: Cross multiply
    81,404.90x = 121,917.80 × 79,162.70
  4. Step 4: Simplify right side
    81,404.90x = 9,651,342,226.06
  5. Step 5: Solve for x
    x = 9,651,342,226.06/81,404.90
  6. Step 6: Final answer
    x = 118,559.72

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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.