Finding the Fourth Proportional to 129,178.36, 178,266.18 and 72,589.96
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Solution
The fourth proportional to 129,178.36, 178,266.18 and 72,589.96 is: 100,174.17
Step by Step Solution
- Step 1: Write the proportion equation
129,178.36 : 178,266.18 = 72,589.96 : x - Step 2: Convert to fraction form
129,178.36/178,266.18 = 72,589.96/x - Step 3: Cross multiply
129,178.36x = 178,266.18 × 72,589.96 - Step 4: Simplify right side
129,178.36x = 12,940,334,875.55 - Step 5: Solve for x
x = 12,940,334,875.55/129,178.36 - Step 6: Final answer
x = 100,174.17
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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.