Finding the Fourth Proportional to 128,431.18, 177,306.28 and 77,456.87
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Solution
The fourth proportional to 128,431.18, 177,306.28 and 77,456.87 is: 106,933.46
Step by Step Solution
- Step 1: Write the proportion equation
128,431.18 : 177,306.28 = 77,456.87 : x - Step 2: Convert to fraction form
128,431.18/177,306.28 = 77,456.87/x - Step 3: Cross multiply
128,431.18x = 177,306.28 × 77,456.87 - Step 4: Simplify right side
128,431.18x = 13,733,589,999.24 - Step 5: Solve for x
x = 13,733,589,999.24/128,431.18 - Step 6: Final answer
x = 106,933.46
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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.