Finding the Fourth Proportional to 103,878.40, 155,817.60 and 86,163.70
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Solution
The fourth proportional to 103,878.40, 155,817.60 and 86,163.70 is: 129,245.55
Step by Step Solution
- Step 1: Write the proportion equation
103,878.40 : 155,817.60 = 86,163.70 : x - Step 2: Convert to fraction form
103,878.40/155,817.60 = 86,163.70/x - Step 3: Cross multiply
103,878.40x = 155,817.60 × 86,163.70 - Step 4: Simplify right side
103,878.40x = 13,425,820,941.12 - Step 5: Solve for x
x = 13,425,820,941.12/103,878.40 - Step 6: Final answer
x = 129,245.55
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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.