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Finding the Fourth Proportional to 1,439,601,481.78, 1,986,649,560.72 and 779,551,759.78

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Solution

The fourth proportional to 1,439,601,481.78, 1,986,649,560.72 and 779,551,759.78 is: 1,075,781,166.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439,601,481.78 : 1,986,649,560.72 = 779,551,759.78 : x
  2. Step 2: Convert to fraction form
    1,439,601,481.78/1,986,649,560.72 = 779,551,759.78/x
  3. Step 3: Cross multiply
    1,439,601,481.78x = 1,986,649,560.72 × 779,551,759.78
  4. Step 4: Simplify right side
    1,439,601,481.78x = 1,548,696,161,125,440,000
  5. Step 5: Solve for x
    x = 1,548,696,161,125,440,000/1,439,601,481.78
  6. Step 6: Final answer
    x = 1,075,781,166.33

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1.5x scale

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.