Finding the Fourth Proportional to 128,308.86, 177,066.45 and 71,720.19
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Solution
The fourth proportional to 128,308.86, 177,066.45 and 71,720.19 is: 98,973.99
Step by Step Solution
- Step 1: Write the proportion equation
128,308.86 : 177,066.45 = 71,720.19 : x - Step 2: Convert to fraction form
128,308.86/177,066.45 = 71,720.19/x - Step 3: Cross multiply
128,308.86x = 177,066.45 × 71,720.19 - Step 4: Simplify right side
128,308.86x = 12,699,239,436.63 - Step 5: Solve for x
x = 12,699,239,436.63/128,308.86 - Step 6: Final answer
x = 98,973.99
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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.