Finding the Fourth Proportional to 100,890.21, 139,241.82 and 65,184.09
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Solution
The fourth proportional to 100,890.21, 139,241.82 and 65,184.09 is: 89,962.66
Step by Step Solution
- Step 1: Write the proportion equation
100,890.21 : 139,241.82 = 65,184.09 : x - Step 2: Convert to fraction form
100,890.21/139,241.82 = 65,184.09/x - Step 3: Cross multiply
100,890.21x = 139,241.82 × 65,184.09 - Step 4: Simplify right side
100,890.21x = 9,076,351,326.64 - Step 5: Solve for x
x = 9,076,351,326.64/100,890.21 - Step 6: Final answer
x = 89,962.66
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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.