Finding the Fourth Proportional to 128.79, 177.73 and 79.75
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Solution
The fourth proportional to 128.79, 177.73 and 79.75 is: 110.06
Step by Step Solution
- Step 1: Write the proportion equation
128.79 : 177.73 = 79.75 : x - Step 2: Convert to fraction form
128.79/177.73 = 79.75/x - Step 3: Cross multiply
128.79x = 177.73 × 79.75 - Step 4: Simplify right side
128.79x = 14,173.99 - Step 5: Solve for x
x = 14,173.99/128.79 - Step 6: Final answer
x = 110.06
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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.