Finding the Fourth Proportional to 644,761.84, 889,853.16 and 390,115.12
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Solution
The fourth proportional to 644,761.84, 889,853.16 and 390,115.12 is: 538,408.37
Step by Step Solution
- Step 1: Write the proportion equation
644,761.84 : 889,853.16 = 390,115.12 : x - Step 2: Convert to fraction form
644,761.84/889,853.16 = 390,115.12/x - Step 3: Cross multiply
644,761.84x = 889,853.16 × 390,115.12 - Step 4: Simplify right side
644,761.84x = 347,145,172,295.78 - Step 5: Solve for x
x = 347,145,172,295.78/644,761.84 - Step 6: Final answer
x = 538,408.37
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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.