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Finding the Fourth Proportional to 128,779.60, 193,169.40 and 122,218.60

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Solution

The fourth proportional to 128,779.60, 193,169.40 and 122,218.60 is: 183,327.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.60 : 193,169.40 = 122,218.60 : x
  2. Step 2: Convert to fraction form
    128,779.60/193,169.40 = 122,218.60/x
  3. Step 3: Cross multiply
    128,779.60x = 193,169.40 × 122,218.60
  4. Step 4: Simplify right side
    128,779.60x = 23,608,893,630.84
  5. Step 5: Solve for x
    x = 23,608,893,630.84/128,779.60
  6. Step 6: Final answer
    x = 183,327.90

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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.