Finding the Fourth Proportional to 75.18, 103.70 and 63.63
Calculator
Solution
The fourth proportional to 75.18, 103.70 and 63.63 is: 87.76
Step by Step Solution
- Step 1: Write the proportion equation
75.18 : 103.70 = 63.63 : x - Step 2: Convert to fraction form
75.18/103.70 = 63.63/x - Step 3: Cross multiply
75.18x = 103.70 × 63.63 - Step 4: Simplify right side
75.18x = 6,598.11 - Step 5: Solve for x
x = 6,598.11/75.18 - Step 6: Final answer
x = 87.76
Related Problems
Find fourth proportional to 37.59, 51.85 and 31.82
Half scale
Find fourth proportional to 150.36, 207.39 and 127.26
Double scale
Find fourth proportional to 76.18, 105.07 and 64.63
Similar ratio
Find fourth proportional to 112.77, 155.54 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.