Finding the Fourth Proportional to 81,361.68, 121,948.80 and 31,419.76
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Solution
The fourth proportional to 81,361.68, 121,948.80 and 31,419.76 is: 47,093.45
Step by Step Solution
- Step 1: Write the proportion equation
81,361.68 : 121,948.80 = 31,419.76 : x - Step 2: Convert to fraction form
81,361.68/121,948.80 = 31,419.76/x - Step 3: Cross multiply
81,361.68x = 121,948.80 × 31,419.76 - Step 4: Simplify right side
81,361.68x = 3,831,602,028.29 - Step 5: Solve for x
x = 3,831,602,028.29/81,361.68 - Step 6: Final answer
x = 47,093.45
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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.