Finding the Fourth Proportional to 138,933.82, 191,739.93 and 78,516.99
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Solution
The fourth proportional to 138,933.82, 191,739.93 and 78,516.99 is: 108,359.81
Step by Step Solution
- Step 1: Write the proportion equation
138,933.82 : 191,739.93 = 78,516.99 : x - Step 2: Convert to fraction form
138,933.82/191,739.93 = 78,516.99/x - Step 3: Cross multiply
138,933.82x = 191,739.93 × 78,516.99 - Step 4: Simplify right side
138,933.82x = 15,054,842,166.41 - Step 5: Solve for x
x = 15,054,842,166.41/138,933.82 - Step 6: Final answer
x = 108,359.81
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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.