Finding the Fourth Proportional to 86.99, 119.99 and 65.12
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Solution
The fourth proportional to 86.99, 119.99 and 65.12 is: 89.82
Step by Step Solution
- Step 1: Write the proportion equation
86.99 : 119.99 = 65.12 : x - Step 2: Convert to fraction form
86.99/119.99 = 65.12/x - Step 3: Cross multiply
86.99x = 119.99 × 65.12 - Step 4: Simplify right side
86.99x = 7,813.31 - Step 5: Solve for x
x = 7,813.31/86.99 - Step 6: Final answer
x = 89.82
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.