Finding the Fourth Proportional to 1,128.36, 1,692 and 478.74
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Solution
The fourth proportional to 1,128.36, 1,692 and 478.74 is: 717.88
Step by Step Solution
- Step 1: Write the proportion equation
1,128.36 : 1,692 = 478.74 : x - Step 2: Convert to fraction form
1,128.36/1,692 = 478.74/x - Step 3: Cross multiply
1,128.36x = 1,692 × 478.74 - Step 4: Simplify right side
1,128.36x = 810,028.08 - Step 5: Solve for x
x = 810,028.08/1,128.36 - Step 6: Final answer
x = 717.88
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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.