Finding the Fourth Proportional to 129,448.72, 178,642.74 and 72,862.12
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Solution
The fourth proportional to 129,448.72, 178,642.74 and 72,862.12 is: 100,551.70
Step by Step Solution
- Step 1: Write the proportion equation
129,448.72 : 178,642.74 = 72,862.12 : x - Step 2: Convert to fraction form
129,448.72/178,642.74 = 72,862.12/x - Step 3: Cross multiply
129,448.72x = 178,642.74 × 72,862.12 - Step 4: Simplify right side
129,448.72x = 13,016,288,759.01 - Step 5: Solve for x
x = 13,016,288,759.01/129,448.72 - Step 6: Final answer
x = 100,551.70
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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.