Finding the Fourth Proportional to 128,415.40, 192,428.70 and 86,813.80
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Solution
The fourth proportional to 128,415.40, 192,428.70 and 86,813.80 is: 130,089.28
Step by Step Solution
- Step 1: Write the proportion equation
128,415.40 : 192,428.70 = 86,813.80 : x - Step 2: Convert to fraction form
128,415.40/192,428.70 = 86,813.80/x - Step 3: Cross multiply
128,415.40x = 192,428.70 × 86,813.80 - Step 4: Simplify right side
128,415.40x = 16,705,466,676.06 - Step 5: Solve for x
x = 16,705,466,676.06/128,415.40 - Step 6: Final answer
x = 130,089.28
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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.