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Finding the Fourth Proportional to 120,861.20, 181,291.80 and 76,683.80

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Solution

The fourth proportional to 120,861.20, 181,291.80 and 76,683.80 is: 115,025.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,861.20 : 181,291.80 = 76,683.80 : x
  2. Step 2: Convert to fraction form
    120,861.20/181,291.80 = 76,683.80/x
  3. Step 3: Cross multiply
    120,861.20x = 181,291.80 × 76,683.80
  4. Step 4: Simplify right side
    120,861.20x = 13,902,144,132.84
  5. Step 5: Solve for x
    x = 13,902,144,132.84/120,861.20
  6. Step 6: Final answer
    x = 115,025.70

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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.