Finding the Fourth Proportional to 7.90, 11.85 and 6
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Solution
The fourth proportional to 7.90, 11.85 and 6 is: 9.00
Step by Step Solution
- Step 1: Write the proportion equation
7.90 : 11.85 = 6 : x - Step 2: Convert to fraction form
7.90/11.85 = 6/x - Step 3: Cross multiply
7.90x = 11.85 × 6 - Step 4: Simplify right side
7.90x = 71.10 - Step 5: Solve for x
x = 71.10/7.90 - Step 6: Final answer
x = 9.00
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.