Finding the Fourth Proportional to 644,759.84, 889,850.40 and 390,113.12
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Solution
The fourth proportional to 644,759.84, 889,850.40 and 390,113.12 is: 538,405.61
Step by Step Solution
- Step 1: Write the proportion equation
644,759.84 : 889,850.40 = 390,113.12 : x - Step 2: Convert to fraction form
644,759.84/889,850.40 = 390,113.12/x - Step 3: Cross multiply
644,759.84x = 889,850.40 × 390,113.12 - Step 4: Simplify right side
644,759.84x = 347,142,315,877.25 - Step 5: Solve for x
x = 347,142,315,877.25/644,759.84 - Step 6: Final answer
x = 538,405.61
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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.