Finding the Fourth Proportional to 992,738,642.20, 1,489,107,963.30 and 659,843,999.80
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Solution
The fourth proportional to 992,738,642.20, 1,489,107,963.30 and 659,843,999.80 is: 989,765,999.70
Step by Step Solution
- Step 1: Write the proportion equation
992,738,642.20 : 1,489,107,963.30 = 659,843,999.80 : x - Step 2: Convert to fraction form
992,738,642.20/1,489,107,963.30 = 659,843,999.80/x - Step 3: Cross multiply
992,738,642.20x = 1,489,107,963.30 × 659,843,999.80 - Step 4: Simplify right side
992,738,642.20x = 982,578,954,637,903,488 - Step 5: Solve for x
x = 982,578,954,637,903,488/992,738,642.20 - Step 6: Final answer
x = 989,765,999.70
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Double scale
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Similar ratio
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1.5x scale
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.