Finding the Fourth Proportional to 100.04, 138.11 and 78.99
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Solution
The fourth proportional to 100.04, 138.11 and 78.99 is: 109.05
Step by Step Solution
- Step 1: Write the proportion equation
100.04 : 138.11 = 78.99 : x - Step 2: Convert to fraction form
100.04/138.11 = 78.99/x - Step 3: Cross multiply
100.04x = 138.11 × 78.99 - Step 4: Simplify right side
100.04x = 10,909.31 - Step 5: Solve for x
x = 10,909.31/100.04 - Step 6: Final answer
x = 109.05
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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.