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Finding the Fourth Proportional to 128,724.40, 193,112.40 and 44,487.64

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Solution

The fourth proportional to 128,724.40, 193,112.40 and 44,487.64 is: 66,740.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,724.40 : 193,112.40 = 44,487.64 : x
  2. Step 2: Convert to fraction form
    128,724.40/193,112.40 = 44,487.64/x
  3. Step 3: Cross multiply
    128,724.40x = 193,112.40 × 44,487.64
  4. Step 4: Simplify right side
    128,724.40x = 8,591,114,930.74
  5. Step 5: Solve for x
    x = 8,591,114,930.74/128,724.40
  6. Step 6: Final answer
    x = 66,740.38

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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.