Finding the Fourth Proportional to 129,089.99, 178,143.77 and 71,729.08
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Solution
The fourth proportional to 129,089.99, 178,143.77 and 71,729.08 is: 98,985.90
Step by Step Solution
- Step 1: Write the proportion equation
129,089.99 : 178,143.77 = 71,729.08 : x - Step 2: Convert to fraction form
129,089.99/178,143.77 = 71,729.08/x - Step 3: Cross multiply
129,089.99x = 178,143.77 × 71,729.08 - Step 4: Simplify right side
129,089.99x = 12,778,088,729.83 - Step 5: Solve for x
x = 12,778,088,729.83/129,089.99 - Step 6: Final answer
x = 98,985.90
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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.