Finding the Fourth Proportional to 420,739.80, 580,642.68 and 257,345.09
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Solution
The fourth proportional to 420,739.80, 580,642.68 and 257,345.09 is: 355,149.52
Step by Step Solution
- Step 1: Write the proportion equation
420,739.80 : 580,642.68 = 257,345.09 : x - Step 2: Convert to fraction form
420,739.80/580,642.68 = 257,345.09/x - Step 3: Cross multiply
420,739.80x = 580,642.68 × 257,345.09 - Step 4: Simplify right side
420,739.80x = 149,425,539,839.23 - Step 5: Solve for x
x = 149,425,539,839.23/420,739.80 - Step 6: Final answer
x = 355,149.52
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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.