Finding the Fourth Proportional to 43.20, 64.42 and 42.08
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Solution
The fourth proportional to 43.20, 64.42 and 42.08 is: 62.75
Step by Step Solution
- Step 1: Write the proportion equation
43.20 : 64.42 = 42.08 : x - Step 2: Convert to fraction form
43.20/64.42 = 42.08/x - Step 3: Cross multiply
43.20x = 64.42 × 42.08 - Step 4: Simplify right side
43.20x = 2,710.79 - Step 5: Solve for x
x = 2,710.79/43.20 - Step 6: Final answer
x = 62.75
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.