Finding the Fourth Proportional to 122.99, 169.80 and 79.40
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Solution
The fourth proportional to 122.99, 169.80 and 79.40 is: 109.62
Step by Step Solution
- Step 1: Write the proportion equation
122.99 : 169.80 = 79.40 : x - Step 2: Convert to fraction form
122.99/169.80 = 79.40/x - Step 3: Cross multiply
122.99x = 169.80 × 79.40 - Step 4: Simplify right side
122.99x = 13,482.12 - Step 5: Solve for x
x = 13,482.12/122.99 - Step 6: Final answer
x = 109.62
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.