Finding the Fourth Proportional to 391,049.15, 539,659.19 and 221,279.63
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Solution
The fourth proportional to 391,049.15, 539,659.19 and 221,279.63 is: 305,372.32
Step by Step Solution
- Step 1: Write the proportion equation
391,049.15 : 539,659.19 = 221,279.63 : x - Step 2: Convert to fraction form
391,049.15/539,659.19 = 221,279.63/x - Step 3: Cross multiply
391,049.15x = 539,659.19 × 221,279.63 - Step 4: Simplify right side
391,049.15x = 119,415,583,744.20 - Step 5: Solve for x
x = 119,415,583,744.20/391,049.15 - Step 6: Final answer
x = 305,372.32
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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.