Finding the Fourth Proportional to 128,708.92, 177,421.42 and 90,360.88
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Solution
The fourth proportional to 128,708.92, 177,421.42 and 90,360.88 is: 124,559.79
Step by Step Solution
- Step 1: Write the proportion equation
128,708.92 : 177,421.42 = 90,360.88 : x - Step 2: Convert to fraction form
128,708.92/177,421.42 = 90,360.88/x - Step 3: Cross multiply
128,708.92x = 177,421.42 × 90,360.88 - Step 4: Simplify right side
128,708.92x = 16,031,955,642.05 - Step 5: Solve for x
x = 16,031,955,642.05/128,708.92 - Step 6: Final answer
x = 124,559.79
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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.