Finding the Fourth Proportional to 428.36, 642.62 and 135.93
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Solution
The fourth proportional to 428.36, 642.62 and 135.93 is: 203.92
Step by Step Solution
- Step 1: Write the proportion equation
428.36 : 642.62 = 135.93 : x - Step 2: Convert to fraction form
428.36/642.62 = 135.93/x - Step 3: Cross multiply
428.36x = 642.62 × 135.93 - Step 4: Simplify right side
428.36x = 87,351.68 - Step 5: Solve for x
x = 87,351.68/428.36 - Step 6: Final answer
x = 203.92
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.