Finding the Fourth Proportional to 124.16, 171.20 and 100.81
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Solution
The fourth proportional to 124.16, 171.20 and 100.81 is: 138.99
Step by Step Solution
- Step 1: Write the proportion equation
124.16 : 171.20 = 100.81 : x - Step 2: Convert to fraction form
124.16/171.20 = 100.81/x - Step 3: Cross multiply
124.16x = 171.20 × 100.81 - Step 4: Simplify right side
124.16x = 17,257.31 - Step 5: Solve for x
x = 17,257.31/124.16 - Step 6: Final answer
x = 138.99
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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.