Finding the Fourth Proportional to 639, 881.46 and 417.90
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Solution
The fourth proportional to 639, 881.46 and 417.90 is: 576.47
Step by Step Solution
- Step 1: Write the proportion equation
639 : 881.46 = 417.90 : x - Step 2: Convert to fraction form
639/881.46 = 417.90/x - Step 3: Cross multiply
639x = 881.46 × 417.90 - Step 4: Simplify right side
639x = 368,362.13 - Step 5: Solve for x
x = 368,362.13/639 - Step 6: Final answer
x = 576.47
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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.