Finding the Fourth Proportional to 100.71, 138.95 and 67.95
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Solution
The fourth proportional to 100.71, 138.95 and 67.95 is: 93.75
Step by Step Solution
- Step 1: Write the proportion equation
100.71 : 138.95 = 67.95 : x - Step 2: Convert to fraction form
100.71/138.95 = 67.95/x - Step 3: Cross multiply
100.71x = 138.95 × 67.95 - Step 4: Simplify right side
100.71x = 9,441.31 - Step 5: Solve for x
x = 9,441.31/100.71 - Step 6: Final answer
x = 93.75
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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.