Finding the Fourth Proportional to 75.29, 103.90 and 42.09
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Solution
The fourth proportional to 75.29, 103.90 and 42.09 is: 58.09
Step by Step Solution
- Step 1: Write the proportion equation
75.29 : 103.90 = 42.09 : x - Step 2: Convert to fraction form
75.29/103.90 = 42.09/x - Step 3: Cross multiply
75.29x = 103.90 × 42.09 - Step 4: Simplify right side
75.29x = 4,373.31 - Step 5: Solve for x
x = 4,373.31/75.29 - Step 6: Final answer
x = 58.09
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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.