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Finding the Fourth Proportional to 13,751,917.75, 18,978,236.99 and 7,640,346.25

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Solution

The fourth proportional to 13,751,917.75, 18,978,236.99 and 7,640,346.25 is: 10,544,005.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,751,917.75 : 18,978,236.99 = 7,640,346.25 : x
  2. Step 2: Convert to fraction form
    13,751,917.75/18,978,236.99 = 7,640,346.25/x
  3. Step 3: Cross multiply
    13,751,917.75x = 18,978,236.99 × 7,640,346.25
  4. Step 4: Simplify right side
    13,751,917.75x = 145,000,301,818,157.78
  5. Step 5: Solve for x
    x = 145,000,301,818,157.78/13,751,917.75
  6. Step 6: Final answer
    x = 10,544,005.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.