Finding the Fourth Proportional to 128,445.26, 177,290.08 and 74,740.68
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Solution
The fourth proportional to 128,445.26, 177,290.08 and 74,740.68 is: 103,162.87
Step by Step Solution
- Step 1: Write the proportion equation
128,445.26 : 177,290.08 = 74,740.68 : x - Step 2: Convert to fraction form
128,445.26/177,290.08 = 74,740.68/x - Step 3: Cross multiply
128,445.26x = 177,290.08 × 74,740.68 - Step 4: Simplify right side
128,445.26x = 13,250,781,136.45 - Step 5: Solve for x
x = 13,250,781,136.45/128,445.26 - Step 6: Final answer
x = 103,162.87
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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.