Finding the Fourth Proportional to 93.39, 128.91 and 87.99
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Solution
The fourth proportional to 93.39, 128.91 and 87.99 is: 121.46
Step by Step Solution
- Step 1: Write the proportion equation
93.39 : 128.91 = 87.99 : x - Step 2: Convert to fraction form
93.39/128.91 = 87.99/x - Step 3: Cross multiply
93.39x = 128.91 × 87.99 - Step 4: Simplify right side
93.39x = 11,342.79 - Step 5: Solve for x
x = 11,342.79/93.39 - Step 6: Final answer
x = 121.46
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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.