Finding the Fourth Proportional to 129.74, 178.99 and 80.53
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Solution
The fourth proportional to 129.74, 178.99 and 80.53 is: 111.10
Step by Step Solution
- Step 1: Write the proportion equation
129.74 : 178.99 = 80.53 : x - Step 2: Convert to fraction form
129.74/178.99 = 80.53/x - Step 3: Cross multiply
129.74x = 178.99 × 80.53 - Step 4: Simplify right side
129.74x = 14,413.42 - Step 5: Solve for x
x = 14,413.42/129.74 - Step 6: Final answer
x = 111.10
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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.