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Finding the Fourth Proportional to 165,978,230.40, 248,967,345.60 and 85,356,662.40

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Solution

The fourth proportional to 165,978,230.40, 248,967,345.60 and 85,356,662.40 is: 128,034,993.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,978,230.40 : 248,967,345.60 = 85,356,662.40 : x
  2. Step 2: Convert to fraction form
    165,978,230.40/248,967,345.60 = 85,356,662.40/x
  3. Step 3: Cross multiply
    165,978,230.40x = 248,967,345.60 × 85,356,662.40
  4. Step 4: Simplify right side
    165,978,230.40x = 21,251,021,667,003,328
  5. Step 5: Solve for x
    x = 21,251,021,667,003,328/165,978,230.40
  6. Step 6: Final answer
    x = 128,034,993.60

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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.