Finding the Fourth Proportional to 85.90, 118.55 and 47.09
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Solution
The fourth proportional to 85.90, 118.55 and 47.09 is: 64.99
Step by Step Solution
- Step 1: Write the proportion equation
85.90 : 118.55 = 47.09 : x - Step 2: Convert to fraction form
85.90/118.55 = 47.09/x - Step 3: Cross multiply
85.90x = 118.55 × 47.09 - Step 4: Simplify right side
85.90x = 5,582.52 - Step 5: Solve for x
x = 5,582.52/85.90 - Step 6: Final answer
x = 64.99
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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.