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Finding the Fourth Proportional to 122,991.40, 184,487.10 and 66,858.40

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Solution

The fourth proportional to 122,991.40, 184,487.10 and 66,858.40 is: 100,287.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,991.40 : 184,487.10 = 66,858.40 : x
  2. Step 2: Convert to fraction form
    122,991.40/184,487.10 = 66,858.40/x
  3. Step 3: Cross multiply
    122,991.40x = 184,487.10 × 66,858.40
  4. Step 4: Simplify right side
    122,991.40x = 12,334,512,326.64
  5. Step 5: Solve for x
    x = 12,334,512,326.64/122,991.40
  6. Step 6: Final answer
    x = 100,287.60

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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.