Finding the Fourth Proportional to 312.99, 431.99 and 208.08
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Solution
The fourth proportional to 312.99, 431.99 and 208.08 is: 287.19
Step by Step Solution
- Step 1: Write the proportion equation
312.99 : 431.99 = 208.08 : x - Step 2: Convert to fraction form
312.99/431.99 = 208.08/x - Step 3: Cross multiply
312.99x = 431.99 × 208.08 - Step 4: Simplify right side
312.99x = 89,887.44 - Step 5: Solve for x
x = 89,887.44/312.99 - Step 6: Final answer
x = 287.19
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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.