Finding the Fourth Proportional to 208.80, 313.01 and 86.99
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Solution
The fourth proportional to 208.80, 313.01 and 86.99 is: 130.40
Step by Step Solution
- Step 1: Write the proportion equation
208.80 : 313.01 = 86.99 : x - Step 2: Convert to fraction form
208.80/313.01 = 86.99/x - Step 3: Cross multiply
208.80x = 313.01 × 86.99 - Step 4: Simplify right side
208.80x = 27,226.74 - Step 5: Solve for x
x = 27,226.74/208.80 - Step 6: Final answer
x = 130.40
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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.