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Finding the Fourth Proportional to 666,598,779.89, 919,906,237.44 and 398,674,571.02

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Solution

The fourth proportional to 666,598,779.89, 919,906,237.44 and 398,674,571.02 is: 550,170,860.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,598,779.89 : 919,906,237.44 = 398,674,571.02 : x
  2. Step 2: Convert to fraction form
    666,598,779.89/919,906,237.44 = 398,674,571.02/x
  3. Step 3: Cross multiply
    666,598,779.89x = 919,906,237.44 × 398,674,571.02
  4. Step 4: Simplify right side
    666,598,779.89x = 366,743,224,590,014,272
  5. Step 5: Solve for x
    x = 366,743,224,590,014,272/666,598,779.89
  6. Step 6: Final answer
    x = 550,170,860.87

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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.