Finding the Fourth Proportional to 1,259,722,512.80, 1,889,583,769.20 and 386,458,661.60
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Solution
The fourth proportional to 1,259,722,512.80, 1,889,583,769.20 and 386,458,661.60 is: 579,687,992.40
Step by Step Solution
- Step 1: Write the proportion equation
1,259,722,512.80 : 1,889,583,769.20 = 386,458,661.60 : x - Step 2: Convert to fraction form
1,259,722,512.80/1,889,583,769.20 = 386,458,661.60/x - Step 3: Cross multiply
1,259,722,512.80x = 1,889,583,769.20 × 386,458,661.60 - Step 4: Simplify right side
1,259,722,512.80x = 730,246,014,426,115,328 - Step 5: Solve for x
x = 730,246,014,426,115,328/1,259,722,512.80 - Step 6: Final answer
x = 579,687,992.40
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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.