Finding the Fourth Proportional to 81,239.15, 121,878.68 and 27,931.91
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Solution
The fourth proportional to 81,239.15, 121,878.68 and 27,931.91 is: 41,904.72
Step by Step Solution
- Step 1: Write the proportion equation
81,239.15 : 121,878.68 = 27,931.91 : x - Step 2: Convert to fraction form
81,239.15/121,878.68 = 27,931.91/x - Step 3: Cross multiply
81,239.15x = 121,878.68 × 27,931.91 - Step 4: Simplify right side
81,239.15x = 3,404,303,571.63 - Step 5: Solve for x
x = 3,404,303,571.63/81,239.15 - Step 6: Final answer
x = 41,904.72
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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.