Finding the Fourth Proportional to 121.78, 167.99 and 84.88
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Solution
The fourth proportional to 121.78, 167.99 and 84.88 is: 117.09
Step by Step Solution
- Step 1: Write the proportion equation
121.78 : 167.99 = 84.88 : x - Step 2: Convert to fraction form
121.78/167.99 = 84.88/x - Step 3: Cross multiply
121.78x = 167.99 × 84.88 - Step 4: Simplify right side
121.78x = 14,258.99 - Step 5: Solve for x
x = 14,258.99/121.78 - Step 6: Final answer
x = 117.09
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.