Finding the Fourth Proportional to 1,315.41, 1,973.48 and 438
Calculator
Solution
The fourth proportional to 1,315.41, 1,973.48 and 438 is: 657.12
Step by Step Solution
- Step 1: Write the proportion equation
1,315.41 : 1,973.48 = 438 : x - Step 2: Convert to fraction form
1,315.41/1,973.48 = 438/x - Step 3: Cross multiply
1,315.41x = 1,973.48 × 438 - Step 4: Simplify right side
1,315.41x = 864,384.24 - Step 5: Solve for x
x = 864,384.24/1,315.41 - Step 6: Final answer
x = 657.12
Related Problems
Find fourth proportional to 657.71, 986.74 and 219
Half scale
Find fourth proportional to 2,630.82, 3,946.96 and 876
Double scale
Find fourth proportional to 1,316.41, 1,974.98 and 439
Similar ratio
Find fourth proportional to 1,973.12, 2,960.22 and 657
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.