Finding the Fourth Proportional to 62.91, 86.55 and 57.09
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Solution
The fourth proportional to 62.91, 86.55 and 57.09 is: 78.54
Step by Step Solution
- Step 1: Write the proportion equation
62.91 : 86.55 = 57.09 : x - Step 2: Convert to fraction form
62.91/86.55 = 57.09/x - Step 3: Cross multiply
62.91x = 86.55 × 57.09 - Step 4: Simplify right side
62.91x = 4,941.14 - Step 5: Solve for x
x = 4,941.14/62.91 - Step 6: Final answer
x = 78.54
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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.