Finding the Fourth Proportional to 79.55, 109.70 and 74.99
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Solution
The fourth proportional to 79.55, 109.70 and 74.99 is: 103.41
Step by Step Solution
- Step 1: Write the proportion equation
79.55 : 109.70 = 74.99 : x - Step 2: Convert to fraction form
79.55/109.70 = 74.99/x - Step 3: Cross multiply
79.55x = 109.70 × 74.99 - Step 4: Simplify right side
79.55x = 8,226.03 - Step 5: Solve for x
x = 8,226.03/79.55 - Step 6: Final answer
x = 103.41
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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.