Finding the Fourth Proportional to 77.40, 106.68 and 63.63
Calculator
Solution
The fourth proportional to 77.40, 106.68 and 63.63 is: 87.70
Step by Step Solution
- Step 1: Write the proportion equation
77.40 : 106.68 = 63.63 : x - Step 2: Convert to fraction form
77.40/106.68 = 63.63/x - Step 3: Cross multiply
77.40x = 106.68 × 63.63 - Step 4: Simplify right side
77.40x = 6,788.05 - Step 5: Solve for x
x = 6,788.05/77.40 - Step 6: Final answer
x = 87.70
Related Problems
Find fourth proportional to 38.70, 53.34 and 31.82
Half scale
Find fourth proportional to 154.80, 213.36 and 127.26
Double scale
Find fourth proportional to 78.40, 108.06 and 64.63
Similar ratio
Find fourth proportional to 116.10, 160.02 and 95.45
1.5x scale
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.