Finding the Fourth Proportional to 687.16, 1,030.08 and 321.64
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Solution
The fourth proportional to 687.16, 1,030.08 and 321.64 is: 482.15
Step by Step Solution
- Step 1: Write the proportion equation
687.16 : 1,030.08 = 321.64 : x - Step 2: Convert to fraction form
687.16/1,030.08 = 321.64/x - Step 3: Cross multiply
687.16x = 1,030.08 × 321.64 - Step 4: Simplify right side
687.16x = 331,314.93 - Step 5: Solve for x
x = 331,314.93/687.16 - Step 6: Final answer
x = 482.15
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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.