Finding the Fourth Proportional to 139,403.68, 192,370.80 and 78,973.09
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Solution
The fourth proportional to 139,403.68, 192,370.80 and 78,973.09 is: 108,979.31
Step by Step Solution
- Step 1: Write the proportion equation
139,403.68 : 192,370.80 = 78,973.09 : x - Step 2: Convert to fraction form
139,403.68/192,370.80 = 78,973.09/x - Step 3: Cross multiply
139,403.68x = 192,370.80 × 78,973.09 - Step 4: Simplify right side
139,403.68x = 15,192,116,501.77 - Step 5: Solve for x
x = 15,192,116,501.77/139,403.68 - Step 6: Final answer
x = 108,979.31
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1.5x scale
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.