Finding the Fourth Proportional to 428,314.99, 642,357.33 and 128,728.66
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Solution
The fourth proportional to 428,314.99, 642,357.33 and 128,728.66 is: 193,058.38
Step by Step Solution
- Step 1: Write the proportion equation
428,314.99 : 642,357.33 = 128,728.66 : x - Step 2: Convert to fraction form
428,314.99/642,357.33 = 128,728.66/x - Step 3: Cross multiply
428,314.99x = 642,357.33 × 128,728.66 - Step 4: Simplify right side
428,314.99x = 82,689,798,332.08 - Step 5: Solve for x
x = 82,689,798,332.08/428,314.99 - Step 6: Final answer
x = 193,058.38
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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.