Finding the Fourth Proportional to 390,496.94, 585,076.74 and 213,128.40
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Solution
The fourth proportional to 390,496.94, 585,076.74 and 213,128.40 is: 319,327.65
Step by Step Solution
- Step 1: Write the proportion equation
390,496.94 : 585,076.74 = 213,128.40 : x - Step 2: Convert to fraction form
390,496.94/585,076.74 = 213,128.40/x - Step 3: Cross multiply
390,496.94x = 585,076.74 × 213,128.40 - Step 4: Simplify right side
390,496.94x = 124,696,469,473.42 - Step 5: Solve for x
x = 124,696,469,473.42/390,496.94 - Step 6: Final answer
x = 319,327.65
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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.