Finding the Fourth Proportional to 390,857.19, 539,337.58 and 218,784.78
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Solution
The fourth proportional to 390,857.19, 539,337.58 and 218,784.78 is: 301,897.62
Step by Step Solution
- Step 1: Write the proportion equation
390,857.19 : 539,337.58 = 218,784.78 : x - Step 2: Convert to fraction form
390,857.19/539,337.58 = 218,784.78/x - Step 3: Cross multiply
390,857.19x = 539,337.58 × 218,784.78 - Step 4: Simplify right side
390,857.19x = 117,998,853,786.03 - Step 5: Solve for x
x = 117,998,853,786.03/390,857.19 - Step 6: Final answer
x = 301,897.62
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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.