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Finding the Fourth Proportional to 81,680.40, 122,520.60 and 71,312.40

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Solution

The fourth proportional to 81,680.40, 122,520.60 and 71,312.40 is: 106,968.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,680.40 : 122,520.60 = 71,312.40 : x
  2. Step 2: Convert to fraction form
    81,680.40/122,520.60 = 71,312.40/x
  3. Step 3: Cross multiply
    81,680.40x = 122,520.60 × 71,312.40
  4. Step 4: Simplify right side
    81,680.40x = 8,737,238,035.44
  5. Step 5: Solve for x
    x = 8,737,238,035.44/81,680.40
  6. Step 6: Final answer
    x = 106,968.60

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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.