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Finding the Fourth Proportional to 11,910.20, 17,865.30 and 9,980.60

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Solution

The fourth proportional to 11,910.20, 17,865.30 and 9,980.60 is: 14,970.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,910.20 : 17,865.30 = 9,980.60 : x
  2. Step 2: Convert to fraction form
    11,910.20/17,865.30 = 9,980.60/x
  3. Step 3: Cross multiply
    11,910.20x = 17,865.30 × 9,980.60
  4. Step 4: Simplify right side
    11,910.20x = 178,306,413.18
  5. Step 5: Solve for x
    x = 178,306,413.18/11,910.20
  6. Step 6: Final answer
    x = 14,970.90

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1.5x scale

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.