Finding the Fourth Proportional to 139.31, 191.79 and 102.42
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Solution
The fourth proportional to 139.31, 191.79 and 102.42 is: 141.00
Step by Step Solution
- Step 1: Write the proportion equation
139.31 : 191.79 = 102.42 : x - Step 2: Convert to fraction form
139.31/191.79 = 102.42/x - Step 3: Cross multiply
139.31x = 191.79 × 102.42 - Step 4: Simplify right side
139.31x = 19,643.13 - Step 5: Solve for x
x = 19,643.13/139.31 - Step 6: Final answer
x = 141.00
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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.