Finding the Fourth Proportional to 93.84, 129.60 and 74.40
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Solution
The fourth proportional to 93.84, 129.60 and 74.40 is: 102.75
Step by Step Solution
- Step 1: Write the proportion equation
93.84 : 129.60 = 74.40 : x - Step 2: Convert to fraction form
93.84/129.60 = 74.40/x - Step 3: Cross multiply
93.84x = 129.60 × 74.40 - Step 4: Simplify right side
93.84x = 9,642.24 - Step 5: Solve for x
x = 9,642.24/93.84 - Step 6: Final answer
x = 102.75
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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.