Finding the Fourth Proportional to 390.99, 585.96 and 207.99
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Solution
The fourth proportional to 390.99, 585.96 and 207.99 is: 311.71
Step by Step Solution
- Step 1: Write the proportion equation
390.99 : 585.96 = 207.99 : x - Step 2: Convert to fraction form
390.99/585.96 = 207.99/x - Step 3: Cross multiply
390.99x = 585.96 × 207.99 - Step 4: Simplify right side
390.99x = 121,873.82 - Step 5: Solve for x
x = 121,873.82/390.99 - Step 6: Final answer
x = 311.71
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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.