Finding the Fourth Proportional to 70.38, 105.51 and 39.99
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Solution
The fourth proportional to 70.38, 105.51 and 39.99 is: 59.95
Step by Step Solution
- Step 1: Write the proportion equation
70.38 : 105.51 = 39.99 : x - Step 2: Convert to fraction form
70.38/105.51 = 39.99/x - Step 3: Cross multiply
70.38x = 105.51 × 39.99 - Step 4: Simplify right side
70.38x = 4,219.34 - Step 5: Solve for x
x = 4,219.34/70.38 - Step 6: Final answer
x = 59.95
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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.