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Finding the Fourth Proportional to 1,259,969.70, 1,889,954.55 and 786,921.60

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Solution

The fourth proportional to 1,259,969.70, 1,889,954.55 and 786,921.60 is: 1,180,382.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259,969.70 : 1,889,954.55 = 786,921.60 : x
  2. Step 2: Convert to fraction form
    1,259,969.70/1,889,954.55 = 786,921.60/x
  3. Step 3: Cross multiply
    1,259,969.70x = 1,889,954.55 × 786,921.60
  4. Step 4: Simplify right side
    1,259,969.70x = 1,487,246,058,413.28
  5. Step 5: Solve for x
    x = 1,487,246,058,413.28/1,259,969.70
  6. Step 6: Final answer
    x = 1,180,382.40

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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.