Finding the Fourth Proportional to 128,421.24, 177,218.70 and 71,833.08
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Solution
The fourth proportional to 128,421.24, 177,218.70 and 71,833.08 is: 99,128.19
Step by Step Solution
- Step 1: Write the proportion equation
128,421.24 : 177,218.70 = 71,833.08 : x - Step 2: Convert to fraction form
128,421.24/177,218.70 = 71,833.08/x - Step 3: Cross multiply
128,421.24x = 177,218.70 × 71,833.08 - Step 4: Simplify right side
128,421.24x = 12,730,165,054.60 - Step 5: Solve for x
x = 12,730,165,054.60/128,421.24 - Step 6: Final answer
x = 99,128.19
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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.