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Finding the Fourth Proportional to 165,978,234.40, 248,967,351.60 and 85,356,666.40

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Solution

The fourth proportional to 165,978,234.40, 248,967,351.60 and 85,356,666.40 is: 128,034,999.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,978,234.40 : 248,967,351.60 = 85,356,666.40 : x
  2. Step 2: Convert to fraction form
    165,978,234.40/248,967,351.60 = 85,356,666.40/x
  3. Step 3: Cross multiply
    165,978,234.40x = 248,967,351.60 × 85,356,666.40
  4. Step 4: Simplify right side
    165,978,234.40x = 21,251,023,175,012,708
  5. Step 5: Solve for x
    x = 21,251,023,175,012,708/165,978,234.40
  6. Step 6: Final answer
    x = 128,034,999.60

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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.