Finding the Fourth Proportional to 80.64, 121.14 and 79.68
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Solution
The fourth proportional to 80.64, 121.14 and 79.68 is: 119.70
Step by Step Solution
- Step 1: Write the proportion equation
80.64 : 121.14 = 79.68 : x - Step 2: Convert to fraction form
80.64/121.14 = 79.68/x - Step 3: Cross multiply
80.64x = 121.14 × 79.68 - Step 4: Simplify right side
80.64x = 9,652.44 - Step 5: Solve for x
x = 9,652.44/80.64 - Step 6: Final answer
x = 119.70
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.