Finding the Fourth Proportional to 81.02, 121.99 and 57.14
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Solution
The fourth proportional to 81.02, 121.99 and 57.14 is: 86.03
Step by Step Solution
- Step 1: Write the proportion equation
81.02 : 121.99 = 57.14 : x - Step 2: Convert to fraction form
81.02/121.99 = 57.14/x - Step 3: Cross multiply
81.02x = 121.99 × 57.14 - Step 4: Simplify right side
81.02x = 6,970.51 - Step 5: Solve for x
x = 6,970.51/81.02 - Step 6: Final answer
x = 86.03
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.