Finding the Fourth Proportional to 28,974,458.26, 39,985,070.70 and 15,921,720.55
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Solution
The fourth proportional to 28,974,458.26, 39,985,070.70 and 15,921,720.55 is: 21,972,149.27
Step by Step Solution
- Step 1: Write the proportion equation
28,974,458.26 : 39,985,070.70 = 15,921,720.55 : x - Step 2: Convert to fraction form
28,974,458.26/39,985,070.70 = 15,921,720.55/x - Step 3: Cross multiply
28,974,458.26x = 39,985,070.70 × 15,921,720.55 - Step 4: Simplify right side
28,974,458.26x = 636,631,121,857,393 - Step 5: Solve for x
x = 636,631,121,857,393/28,974,458.26 - Step 6: Final answer
x = 21,972,149.27
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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.