Finding the Fourth Proportional to 155.65, 214.68 and 129.68
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Solution
The fourth proportional to 155.65, 214.68 and 129.68 is: 178.86
Step by Step Solution
- Step 1: Write the proportion equation
155.65 : 214.68 = 129.68 : x - Step 2: Convert to fraction form
155.65/214.68 = 129.68/x - Step 3: Cross multiply
155.65x = 214.68 × 129.68 - Step 4: Simplify right side
155.65x = 27,840.81 - Step 5: Solve for x
x = 27,840.81/155.65 - Step 6: Final answer
x = 178.86
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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.