Finding the Fourth Proportional to 129,568.80, 178,808.64 and 72,985.44
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Solution
The fourth proportional to 129,568.80, 178,808.64 and 72,985.44 is: 100,721.99
Step by Step Solution
- Step 1: Write the proportion equation
129,568.80 : 178,808.64 = 72,985.44 : x - Step 2: Convert to fraction form
129,568.80/178,808.64 = 72,985.44/x - Step 3: Cross multiply
129,568.80x = 178,808.64 × 72,985.44 - Step 4: Simplify right side
129,568.80x = 13,050,427,266.20 - Step 5: Solve for x
x = 13,050,427,266.20/129,568.80 - Step 6: Final answer
x = 100,721.99
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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.