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Finding the Fourth Proportional to 80,840.40, 121,260.60 and 77,211.60

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Solution

The fourth proportional to 80,840.40, 121,260.60 and 77,211.60 is: 115,817.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,840.40 : 121,260.60 = 77,211.60 : x
  2. Step 2: Convert to fraction form
    80,840.40/121,260.60 = 77,211.60/x
  3. Step 3: Cross multiply
    80,840.40x = 121,260.60 × 77,211.60
  4. Step 4: Simplify right side
    80,840.40x = 9,362,724,942.96
  5. Step 5: Solve for x
    x = 9,362,724,942.96/80,840.40
  6. Step 6: Final answer
    x = 115,817.40

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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.