Finding the Fourth Proportional to 390,211.36, 538,480.37 and 218,129.63
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Solution
The fourth proportional to 390,211.36, 538,480.37 and 218,129.63 is: 301,012.57
Step by Step Solution
- Step 1: Write the proportion equation
390,211.36 : 538,480.37 = 218,129.63 : x - Step 2: Convert to fraction form
390,211.36/538,480.37 = 218,129.63/x - Step 3: Cross multiply
390,211.36x = 538,480.37 × 218,129.63 - Step 4: Simplify right side
390,211.36x = 117,458,521,723.29 - Step 5: Solve for x
x = 117,458,521,723.29/390,211.36 - Step 6: Final answer
x = 301,012.57
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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.