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Finding the Fourth Proportional to 128,886.60, 193,329.90 and 120,138.60

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Solution

The fourth proportional to 128,886.60, 193,329.90 and 120,138.60 is: 180,207.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,886.60 : 193,329.90 = 120,138.60 : x
  2. Step 2: Convert to fraction form
    128,886.60/193,329.90 = 120,138.60/x
  3. Step 3: Cross multiply
    128,886.60x = 193,329.90 × 120,138.60
  4. Step 4: Simplify right side
    128,886.60x = 23,226,383,524.14
  5. Step 5: Solve for x
    x = 23,226,383,524.14/128,886.60
  6. Step 6: Final answer
    x = 180,207.90

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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.