Finding the Fourth Proportional to 42.76, 58.97 and 31.18
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Solution
The fourth proportional to 42.76, 58.97 and 31.18 is: 42.99
Step by Step Solution
- Step 1: Write the proportion equation
42.76 : 58.97 = 31.18 : x - Step 2: Convert to fraction form
42.76/58.97 = 31.18/x - Step 3: Cross multiply
42.76x = 58.97 × 31.18 - Step 4: Simplify right side
42.76x = 1,838.23 - Step 5: Solve for x
x = 1,838.23/42.76 - Step 6: Final answer
x = 42.99
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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.