Finding the Fourth Proportional to 286.91, 430.36 and 91.90
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Solution
The fourth proportional to 286.91, 430.36 and 91.90 is: 137.85
Step by Step Solution
- Step 1: Write the proportion equation
286.91 : 430.36 = 91.90 : x - Step 2: Convert to fraction form
286.91/430.36 = 91.90/x - Step 3: Cross multiply
286.91x = 430.36 × 91.90 - Step 4: Simplify right side
286.91x = 39,550.08 - Step 5: Solve for x
x = 39,550.08/286.91 - Step 6: Final answer
x = 137.85
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.