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Finding the Fourth Proportional to 128,979.81, 193,197.15 and 81,570.51

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Solution

The fourth proportional to 128,979.81, 193,197.15 and 81,570.51 is: 122,183.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.81 : 193,197.15 = 81,570.51 : x
  2. Step 2: Convert to fraction form
    128,979.81/193,197.15 = 81,570.51/x
  3. Step 3: Cross multiply
    128,979.81x = 193,197.15 × 81,570.51
  4. Step 4: Simplify right side
    128,979.81x = 15,759,190,056.05
  5. Step 5: Solve for x
    x = 15,759,190,056.05/128,979.81
  6. Step 6: Final answer
    x = 122,183.39

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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.