Finding the Fourth Proportional to 129,106.29, 178,006.49 and 85,991.31
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Solution
The fourth proportional to 129,106.29, 178,006.49 and 85,991.31 is: 118,561.31
Step by Step Solution
- Step 1: Write the proportion equation
129,106.29 : 178,006.49 = 85,991.31 : x - Step 2: Convert to fraction form
129,106.29/178,006.49 = 85,991.31/x - Step 3: Cross multiply
129,106.29x = 178,006.49 × 85,991.31 - Step 4: Simplify right side
129,106.29x = 15,307,011,156.11 - Step 5: Solve for x
x = 15,307,011,156.11/129,106.29 - Step 6: Final answer
x = 118,561.31
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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.