Finding the Fourth Proportional to 128,918.16, 177,897.60 and 71,560.80
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Solution
The fourth proportional to 128,918.16, 177,897.60 and 71,560.80 is: 98,748.65
Step by Step Solution
- Step 1: Write the proportion equation
128,918.16 : 177,897.60 = 71,560.80 : x - Step 2: Convert to fraction form
128,918.16/177,897.60 = 71,560.80/x - Step 3: Cross multiply
128,918.16x = 177,897.60 × 71,560.80 - Step 4: Simplify right side
128,918.16x = 12,730,494,574.08 - Step 5: Solve for x
x = 12,730,494,574.08/128,918.16 - Step 6: Final answer
x = 98,748.65
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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.