Finding the Fourth Proportional to 645,137.76, 890,239.68 and 358,640.40
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Solution
The fourth proportional to 645,137.76, 890,239.68 and 358,640.40 is: 494,895.72
Step by Step Solution
- Step 1: Write the proportion equation
645,137.76 : 890,239.68 = 358,640.40 : x - Step 2: Convert to fraction form
645,137.76/890,239.68 = 358,640.40/x - Step 3: Cross multiply
645,137.76x = 890,239.68 × 358,640.40 - Step 4: Simplify right side
645,137.76x = 319,275,914,931.07 - Step 5: Solve for x
x = 319,275,914,931.07/645,137.76 - Step 6: Final answer
x = 494,895.72
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1.5x scale
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.