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Finding the Fourth Proportional to 122,990.60, 184,485.90 and 120,657.80

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Solution

The fourth proportional to 122,990.60, 184,485.90 and 120,657.80 is: 180,986.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,990.60 : 184,485.90 = 120,657.80 : x
  2. Step 2: Convert to fraction form
    122,990.60/184,485.90 = 120,657.80/x
  3. Step 3: Cross multiply
    122,990.60x = 184,485.90 × 120,657.80
  4. Step 4: Simplify right side
    122,990.60x = 22,259,662,825.02
  5. Step 5: Solve for x
    x = 22,259,662,825.02/122,990.60
  6. Step 6: Final answer
    x = 180,986.70

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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.