Finding the Fourth Proportional to 79.99, 120.21 and 79.55
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Solution
The fourth proportional to 79.99, 120.21 and 79.55 is: 119.55
Step by Step Solution
- Step 1: Write the proportion equation
79.99 : 120.21 = 79.55 : x - Step 2: Convert to fraction form
79.99/120.21 = 79.55/x - Step 3: Cross multiply
79.99x = 120.21 × 79.55 - Step 4: Simplify right side
79.99x = 9,562.71 - Step 5: Solve for x
x = 9,562.71/79.99 - Step 6: Final answer
x = 119.55
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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.