Finding the Fourth Proportional to 643.30, 964.26 and 278.26
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Solution
The fourth proportional to 643.30, 964.26 and 278.26 is: 417.09
Step by Step Solution
- Step 1: Write the proportion equation
643.30 : 964.26 = 278.26 : x - Step 2: Convert to fraction form
643.30/964.26 = 278.26/x - Step 3: Cross multiply
643.30x = 964.26 × 278.26 - Step 4: Simplify right side
643.30x = 268,314.99 - Step 5: Solve for x
x = 268,314.99/643.30 - Step 6: Final answer
x = 417.09
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.