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Finding the Fourth Proportional to 128,691,907.90, 193,037,861.85 and 128,691,907.90

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Solution

The fourth proportional to 128,691,907.90, 193,037,861.85 and 128,691,907.90 is: 193,037,861.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,691,907.90 : 193,037,861.85 = 128,691,907.90 : x
  2. Step 2: Convert to fraction form
    128,691,907.90/193,037,861.85 = 128,691,907.90/x
  3. Step 3: Cross multiply
    128,691,907.90x = 193,037,861.85 × 128,691,907.90
  4. Step 4: Simplify right side
    128,691,907.90x = 24,842,410,738,413,124
  5. Step 5: Solve for x
    x = 24,842,410,738,413,124/128,691,907.90
  6. Step 6: Final answer
    x = 193,037,861.85

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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.