Finding the Fourth Proportional to 87.58, 120.49 and 79.79
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Solution
The fourth proportional to 87.58, 120.49 and 79.79 is: 109.76
Step by Step Solution
- Step 1: Write the proportion equation
87.58 : 120.49 = 79.79 : x - Step 2: Convert to fraction form
87.58/120.49 = 79.79/x - Step 3: Cross multiply
87.58x = 120.49 × 79.79 - Step 4: Simplify right side
87.58x = 9,613.10 - Step 5: Solve for x
x = 9,613.10/87.58 - Step 6: Final answer
x = 109.76
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.