Finding the Fourth Proportional to 128,131.62, 176,811.45 and 74,407.80
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Solution
The fourth proportional to 128,131.62, 176,811.45 and 74,407.80 is: 102,676.85
Step by Step Solution
- Step 1: Write the proportion equation
128,131.62 : 176,811.45 = 74,407.80 : x - Step 2: Convert to fraction form
128,131.62/176,811.45 = 74,407.80/x - Step 3: Cross multiply
128,131.62x = 176,811.45 × 74,407.80 - Step 4: Simplify right side
128,131.62x = 13,156,151,009.31 - Step 5: Solve for x
x = 13,156,151,009.31/128,131.62 - Step 6: Final answer
x = 102,676.85
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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.