Finding the Fourth Proportional to 1,188,874,720.78, 1,640,450,262.81 and 687,130,226.95
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Solution
The fourth proportional to 1,188,874,720.78, 1,640,450,262.81 and 687,130,226.95 is: 948,125,939.32
Step by Step Solution
- Step 1: Write the proportion equation
1,188,874,720.78 : 1,640,450,262.81 = 687,130,226.95 : x - Step 2: Convert to fraction form
1,188,874,720.78/1,640,450,262.81 = 687,130,226.95/x - Step 3: Cross multiply
1,188,874,720.78x = 1,640,450,262.81 × 687,130,226.95 - Step 4: Simplify right side
1,188,874,720.78x = 1,127,202,961,378,783,488 - Step 5: Solve for x
x = 1,127,202,961,378,783,488/1,188,874,720.78 - Step 6: Final answer
x = 948,125,939.32
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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.