Finding the Fourth Proportional to 75.12, 113.29 and 68.64
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Solution
The fourth proportional to 75.12, 113.29 and 68.64 is: 103.52
Step by Step Solution
- Step 1: Write the proportion equation
75.12 : 113.29 = 68.64 : x - Step 2: Convert to fraction form
75.12/113.29 = 68.64/x - Step 3: Cross multiply
75.12x = 113.29 × 68.64 - Step 4: Simplify right side
75.12x = 7,776.23 - Step 5: Solve for x
x = 7,776.23/75.12 - Step 6: Final answer
x = 103.52
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.