Finding the Fourth Proportional to 390,879.40, 539,422.70 and 218,793.08
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Solution
The fourth proportional to 390,879.40, 539,422.70 and 218,793.08 is: 301,939.56
Step by Step Solution
- Step 1: Write the proportion equation
390,879.40 : 539,422.70 = 218,793.08 : x - Step 2: Convert to fraction form
390,879.40/539,422.70 = 218,793.08/x - Step 3: Cross multiply
390,879.40x = 539,422.70 × 218,793.08 - Step 4: Simplify right side
390,879.40x = 118,021,953,954.92 - Step 5: Solve for x
x = 118,021,953,954.92/390,879.40 - Step 6: Final answer
x = 301,939.56
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1.5x scale
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.