Finding the Fourth Proportional to 128,394.78, 177,110.55 and 77,372.70
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Solution
The fourth proportional to 128,394.78, 177,110.55 and 77,372.70 is: 106,729.58
Step by Step Solution
- Step 1: Write the proportion equation
128,394.78 : 177,110.55 = 77,372.70 : x - Step 2: Convert to fraction form
128,394.78/177,110.55 = 77,372.70/x - Step 3: Cross multiply
128,394.78x = 177,110.55 × 77,372.70 - Step 4: Simplify right side
128,394.78x = 13,703,521,451.99 - Step 5: Solve for x
x = 13,703,521,451.99/128,394.78 - Step 6: Final answer
x = 106,729.58
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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.