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Finding the Fourth Proportional to 128,691,910.40, 193,037,865.60 and 128,691,910.40

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Solution

The fourth proportional to 128,691,910.40, 193,037,865.60 and 128,691,910.40 is: 193,037,865.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,691,910.40 : 193,037,865.60 = 128,691,910.40 : x
  2. Step 2: Convert to fraction form
    128,691,910.40/193,037,865.60 = 128,691,910.40/x
  3. Step 3: Cross multiply
    128,691,910.40x = 193,037,865.60 × 128,691,910.40
  4. Step 4: Simplify right side
    128,691,910.40x = 24,842,411,703,602,444
  5. Step 5: Solve for x
    x = 24,842,411,703,602,444/128,691,910.40
  6. Step 6: Final answer
    x = 193,037,865.60

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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.