Finding the Fourth Proportional to 128,840.10, 193,405.95 and 76,279.20
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Solution
The fourth proportional to 128,840.10, 193,405.95 and 76,279.20 is: 114,505.12
Step by Step Solution
- Step 1: Write the proportion equation
128,840.10 : 193,405.95 = 76,279.20 : x - Step 2: Convert to fraction form
128,840.10/193,405.95 = 76,279.20/x - Step 3: Cross multiply
128,840.10x = 193,405.95 × 76,279.20 - Step 4: Simplify right side
128,840.10x = 14,752,851,141.24 - Step 5: Solve for x
x = 14,752,851,141.24/128,840.10 - Step 6: Final answer
x = 114,505.12
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.