Finding the Fourth Proportional to 681.15, 1,021.75 and 420.99
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Solution
The fourth proportional to 681.15, 1,021.75 and 420.99 is: 631.50
Step by Step Solution
- Step 1: Write the proportion equation
681.15 : 1,021.75 = 420.99 : x - Step 2: Convert to fraction form
681.15/1,021.75 = 420.99/x - Step 3: Cross multiply
681.15x = 1,021.75 × 420.99 - Step 4: Simplify right side
681.15x = 430,146.53 - Step 5: Solve for x
x = 430,146.53/681.15 - Step 6: Final answer
x = 631.50
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1.5x scale
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.