Finding the Fourth Proportional to 90.62, 125.39 and 78.99
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Solution
The fourth proportional to 90.62, 125.39 and 78.99 is: 109.30
Step by Step Solution
- Step 1: Write the proportion equation
90.62 : 125.39 = 78.99 : x - Step 2: Convert to fraction form
90.62/125.39 = 78.99/x - Step 3: Cross multiply
90.62x = 125.39 × 78.99 - Step 4: Simplify right side
90.62x = 9,904.89 - Step 5: Solve for x
x = 9,904.89/90.62 - Step 6: Final answer
x = 109.30
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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.