Finding the Fourth Proportional to 139.21, 208.71 and 58.07
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Solution
The fourth proportional to 139.21, 208.71 and 58.07 is: 87.07
Step by Step Solution
- Step 1: Write the proportion equation
139.21 : 208.71 = 58.07 : x - Step 2: Convert to fraction form
139.21/208.71 = 58.07/x - Step 3: Cross multiply
139.21x = 208.71 × 58.07 - Step 4: Simplify right side
139.21x = 12,120.31 - Step 5: Solve for x
x = 12,120.31/139.21 - Step 6: Final answer
x = 87.07
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.