Finding the Fourth Proportional to 79.70, 109.62 and 74.12
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Solution
The fourth proportional to 79.70, 109.62 and 74.12 is: 101.95
Step by Step Solution
- Step 1: Write the proportion equation
79.70 : 109.62 = 74.12 : x - Step 2: Convert to fraction form
79.70/109.62 = 74.12/x - Step 3: Cross multiply
79.70x = 109.62 × 74.12 - Step 4: Simplify right side
79.70x = 8,125.03 - Step 5: Solve for x
x = 8,125.03/79.70 - Step 6: Final answer
x = 101.95
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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.