Finding the Fourth Proportional to 71.74, 99.00 and 38.99
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Solution
The fourth proportional to 71.74, 99.00 and 38.99 is: 53.81
Step by Step Solution
- Step 1: Write the proportion equation
71.74 : 99.00 = 38.99 : x - Step 2: Convert to fraction form
71.74/99.00 = 38.99/x - Step 3: Cross multiply
71.74x = 99.00 × 38.99 - Step 4: Simplify right side
71.74x = 3,860.04 - Step 5: Solve for x
x = 3,860.04/71.74 - Step 6: Final answer
x = 53.81
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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.