Finding the Fourth Proportional to 519,139.80, 778,709.70 and 431,659.80
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Solution
The fourth proportional to 519,139.80, 778,709.70 and 431,659.80 is: 647,489.70
Step by Step Solution
- Step 1: Write the proportion equation
519,139.80 : 778,709.70 = 431,659.80 : x - Step 2: Convert to fraction form
519,139.80/778,709.70 = 431,659.80/x - Step 3: Cross multiply
519,139.80x = 778,709.70 × 431,659.80 - Step 4: Simplify right side
519,139.80x = 336,137,673,360.06 - Step 5: Solve for x
x = 336,137,673,360.06/519,139.80 - Step 6: Final answer
x = 647,489.70
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Similar ratio
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.