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Finding the Fourth Proportional to 91,364.70, 137,047.05 and 80,919.90

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Solution

The fourth proportional to 91,364.70, 137,047.05 and 80,919.90 is: 121,379.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,364.70 : 137,047.05 = 80,919.90 : x
  2. Step 2: Convert to fraction form
    91,364.70/137,047.05 = 80,919.90/x
  3. Step 3: Cross multiply
    91,364.70x = 137,047.05 × 80,919.90
  4. Step 4: Simplify right side
    91,364.70x = 11,089,833,581.30
  5. Step 5: Solve for x
    x = 11,089,833,581.30/91,364.70
  6. Step 6: Final answer
    x = 121,379.85

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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.