Finding the Fourth Proportional to 390,128.38, 538,420.97 and 220,373.44
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Solution
The fourth proportional to 390,128.38, 538,420.97 and 220,373.44 is: 304,140.09
Step by Step Solution
- Step 1: Write the proportion equation
390,128.38 : 538,420.97 = 220,373.44 : x - Step 2: Convert to fraction form
390,128.38/538,420.97 = 220,373.44/x - Step 3: Cross multiply
390,128.38x = 538,420.97 × 220,373.44 - Step 4: Simplify right side
390,128.38x = 118,653,681,327.04 - Step 5: Solve for x
x = 118,653,681,327.04/390,128.38 - Step 6: Final answer
x = 304,140.09
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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.