Finding the Fourth Proportional to 87.80, 121.08 and 73.20
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Solution
The fourth proportional to 87.80, 121.08 and 73.20 is: 100.95
Step by Step Solution
- Step 1: Write the proportion equation
87.80 : 121.08 = 73.20 : x - Step 2: Convert to fraction form
87.80/121.08 = 73.20/x - Step 3: Cross multiply
87.80x = 121.08 × 73.20 - Step 4: Simplify right side
87.80x = 8,863.06 - Step 5: Solve for x
x = 8,863.06/87.80 - Step 6: Final answer
x = 100.95
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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.