Finding the Fourth Proportional to 128,620.38, 177,398.55 and 112,677.15
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Solution
The fourth proportional to 128,620.38, 177,398.55 and 112,677.15 is: 155,408.99
Step by Step Solution
- Step 1: Write the proportion equation
128,620.38 : 177,398.55 = 112,677.15 : x - Step 2: Convert to fraction form
128,620.38/177,398.55 = 112,677.15/x - Step 3: Cross multiply
128,620.38x = 177,398.55 × 112,677.15 - Step 4: Simplify right side
128,620.38x = 19,988,763,028.13 - Step 5: Solve for x
x = 19,988,763,028.13/128,620.38 - Step 6: Final answer
x = 155,408.99
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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.