Finding the Fourth Proportional to 65.79, 90.86 and 55.99
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Solution
The fourth proportional to 65.79, 90.86 and 55.99 is: 77.33
Step by Step Solution
- Step 1: Write the proportion equation
65.79 : 90.86 = 55.99 : x - Step 2: Convert to fraction form
65.79/90.86 = 55.99/x - Step 3: Cross multiply
65.79x = 90.86 × 55.99 - Step 4: Simplify right side
65.79x = 5,087.25 - Step 5: Solve for x
x = 5,087.25/65.79 - Step 6: Final answer
x = 77.33
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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.