Finding the Fourth Proportional to 143.55, 215.37 and 71.31
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Solution
The fourth proportional to 143.55, 215.37 and 71.31 is: 106.99
Step by Step Solution
- Step 1: Write the proportion equation
143.55 : 215.37 = 71.31 : x - Step 2: Convert to fraction form
143.55/215.37 = 71.31/x - Step 3: Cross multiply
143.55x = 215.37 × 71.31 - Step 4: Simplify right side
143.55x = 15,358.03 - Step 5: Solve for x
x = 15,358.03/143.55 - Step 6: Final answer
x = 106.99
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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.