Finding the Fourth Proportional to 87.96, 130.98 and 86.99
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Solution
The fourth proportional to 87.96, 130.98 and 86.99 is: 129.54
Step by Step Solution
- Step 1: Write the proportion equation
87.96 : 130.98 = 86.99 : x - Step 2: Convert to fraction form
87.96/130.98 = 86.99/x - Step 3: Cross multiply
87.96x = 130.98 × 86.99 - Step 4: Simplify right side
87.96x = 11,393.95 - Step 5: Solve for x
x = 11,393.95/87.96 - Step 6: Final answer
x = 129.54
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.