Finding the Fourth Proportional to 355.40, 489.99 and 257.18
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Solution
The fourth proportional to 355.40, 489.99 and 257.18 is: 354.57
Step by Step Solution
- Step 1: Write the proportion equation
355.40 : 489.99 = 257.18 : x - Step 2: Convert to fraction form
355.40/489.99 = 257.18/x - Step 3: Cross multiply
355.40x = 489.99 × 257.18 - Step 4: Simplify right side
355.40x = 126,015.63 - Step 5: Solve for x
x = 126,015.63/355.40 - Step 6: Final answer
x = 354.57
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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.