Finding the Fourth Proportional to 390,753.09, 539,120.21 and 218,653.20
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Solution
The fourth proportional to 390,753.09, 539,120.21 and 218,653.20 is: 301,674.79
Step by Step Solution
- Step 1: Write the proportion equation
390,753.09 : 539,120.21 = 218,653.20 : x - Step 2: Convert to fraction form
390,753.09/539,120.21 = 218,653.20/x - Step 3: Cross multiply
390,753.09x = 539,120.21 × 218,653.20 - Step 4: Simplify right side
390,753.09x = 117,880,358,007.91 - Step 5: Solve for x
x = 117,880,358,007.91/390,753.09 - Step 6: Final answer
x = 301,674.79
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.