Finding the Fourth Proportional to 421.08, 631.08 and 340.08
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Solution
The fourth proportional to 421.08, 631.08 and 340.08 is: 509.68
Step by Step Solution
- Step 1: Write the proportion equation
421.08 : 631.08 = 340.08 : x - Step 2: Convert to fraction form
421.08/631.08 = 340.08/x - Step 3: Cross multiply
421.08x = 631.08 × 340.08 - Step 4: Simplify right side
421.08x = 214,617.69 - Step 5: Solve for x
x = 214,617.69/421.08 - Step 6: Final answer
x = 509.68
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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.