Finding the Fourth Proportional to 90.09, 124.28 and 55.09
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Solution
The fourth proportional to 90.09, 124.28 and 55.09 is: 76.00
Step by Step Solution
- Step 1: Write the proportion equation
90.09 : 124.28 = 55.09 : x - Step 2: Convert to fraction form
90.09/124.28 = 55.09/x - Step 3: Cross multiply
90.09x = 124.28 × 55.09 - Step 4: Simplify right side
90.09x = 6,846.59 - Step 5: Solve for x
x = 6,846.59/90.09 - Step 6: Final answer
x = 76.00
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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.