Finding the Fourth Proportional to 19.99, 29.99 and 8.58
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Solution
The fourth proportional to 19.99, 29.99 and 8.58 is: 12.87
Step by Step Solution
- Step 1: Write the proportion equation
19.99 : 29.99 = 8.58 : x - Step 2: Convert to fraction form
19.99/29.99 = 8.58/x - Step 3: Cross multiply
19.99x = 29.99 × 8.58 - Step 4: Simplify right side
19.99x = 257.29 - Step 5: Solve for x
x = 257.29/19.99 - Step 6: Final answer
x = 12.87
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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.