Finding the Fourth Proportional to 156.85, 216.44 and 86.91
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Solution
The fourth proportional to 156.85, 216.44 and 86.91 is: 119.92
Step by Step Solution
- Step 1: Write the proportion equation
156.85 : 216.44 = 86.91 : x - Step 2: Convert to fraction form
156.85/216.44 = 86.91/x - Step 3: Cross multiply
156.85x = 216.44 × 86.91 - Step 4: Simplify right side
156.85x = 18,809.88 - Step 5: Solve for x
x = 18,809.88/156.85 - Step 6: Final answer
x = 119.92
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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.