Finding the Fourth Proportional to 216.79, 298.99 and 129.38
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Solution
The fourth proportional to 216.79, 298.99 and 129.38 is: 178.43
Step by Step Solution
- Step 1: Write the proportion equation
216.79 : 298.99 = 129.38 : x - Step 2: Convert to fraction form
216.79/298.99 = 129.38/x - Step 3: Cross multiply
216.79x = 298.99 × 129.38 - Step 4: Simplify right side
216.79x = 38,681.99 - Step 5: Solve for x
x = 38,681.99/216.79 - Step 6: Final answer
x = 178.43
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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.