Finding the Fourth Proportional to 79.11, 108.99 and 74.55
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Solution
The fourth proportional to 79.11, 108.99 and 74.55 is: 102.71
Step by Step Solution
- Step 1: Write the proportion equation
79.11 : 108.99 = 74.55 : x - Step 2: Convert to fraction form
79.11/108.99 = 74.55/x - Step 3: Cross multiply
79.11x = 108.99 × 74.55 - Step 4: Simplify right side
79.11x = 8,125.20 - Step 5: Solve for x
x = 8,125.20/79.11 - Step 6: Final answer
x = 102.71
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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.