Finding the Fourth Proportional to 257.21, 386.10 and 135.44
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Solution
The fourth proportional to 257.21, 386.10 and 135.44 is: 203.31
Step by Step Solution
- Step 1: Write the proportion equation
257.21 : 386.10 = 135.44 : x - Step 2: Convert to fraction form
257.21/386.10 = 135.44/x - Step 3: Cross multiply
257.21x = 386.10 × 135.44 - Step 4: Simplify right side
257.21x = 52,294.35 - Step 5: Solve for x
x = 52,294.35/257.21 - Step 6: Final answer
x = 203.31
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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.