Finding the Fourth Proportional to 89,988.70, 135,121.77 and 76,130.81
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Solution
The fourth proportional to 89,988.70, 135,121.77 and 76,130.81 is: 114,313.57
Step by Step Solution
- Step 1: Write the proportion equation
89,988.70 : 135,121.77 = 76,130.81 : x - Step 2: Convert to fraction form
89,988.70/135,121.77 = 76,130.81/x - Step 3: Cross multiply
89,988.70x = 135,121.77 × 76,130.81 - Step 4: Simplify right side
89,988.70x = 10,286,929,418.08 - Step 5: Solve for x
x = 10,286,929,418.08/89,988.70 - Step 6: Final answer
x = 114,313.57
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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.