Finding the Fourth Proportional to 390,879.60, 539,415.84 and 221,110.08
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Solution
The fourth proportional to 390,879.60, 539,415.84 and 221,110.08 is: 305,133.04
Step by Step Solution
- Step 1: Write the proportion equation
390,879.60 : 539,415.84 = 221,110.08 : x - Step 2: Convert to fraction form
390,879.60/539,415.84 = 221,110.08/x - Step 3: Cross multiply
390,879.60x = 539,415.84 × 221,110.08 - Step 4: Simplify right side
390,879.60x = 119,270,279,535.67 - Step 5: Solve for x
x = 119,270,279,535.67/390,879.60 - Step 6: Final answer
x = 305,133.04
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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.