Finding the Fourth Proportional to 687.88, 948.99 and 491.68
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Solution
The fourth proportional to 687.88, 948.99 and 491.68 is: 678.32
Step by Step Solution
- Step 1: Write the proportion equation
687.88 : 948.99 = 491.68 : x - Step 2: Convert to fraction form
687.88/948.99 = 491.68/x - Step 3: Cross multiply
687.88x = 948.99 × 491.68 - Step 4: Simplify right side
687.88x = 466,599.40 - Step 5: Solve for x
x = 466,599.40/687.88 - Step 6: Final answer
x = 678.32
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1.5x scale
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.