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Finding the Fourth Proportional to 13,751,919.75, 18,978,239.76 and 7,640,348.25

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Solution

The fourth proportional to 13,751,919.75, 18,978,239.76 and 7,640,348.25 is: 10,544,008.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,751,919.75 : 18,978,239.76 = 7,640,348.25 : x
  2. Step 2: Convert to fraction form
    13,751,919.75/18,978,239.76 = 7,640,348.25/x
  3. Step 3: Cross multiply
    13,751,919.75x = 18,978,239.76 × 7,640,348.25
  4. Step 4: Simplify right side
    13,751,919.75x = 145,000,360,938,396.44
  5. Step 5: Solve for x
    x = 145,000,360,938,396.44/13,751,919.75
  6. Step 6: Final answer
    x = 10,544,008.66

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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.