Finding the Fourth Proportional to 642.88, 887.55 and 487.36
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Solution
The fourth proportional to 642.88, 887.55 and 487.36 is: 672.84
Step by Step Solution
- Step 1: Write the proportion equation
642.88 : 887.55 = 487.36 : x - Step 2: Convert to fraction form
642.88/887.55 = 487.36/x - Step 3: Cross multiply
642.88x = 887.55 × 487.36 - Step 4: Simplify right side
642.88x = 432,551.93 - Step 5: Solve for x
x = 432,551.93/642.88 - Step 6: Final answer
x = 672.84
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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.