Finding the Fourth Proportional to 919.62, 1,378.26 and 432
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Solution
The fourth proportional to 919.62, 1,378.26 and 432 is: 647.45
Step by Step Solution
- Step 1: Write the proportion equation
919.62 : 1,378.26 = 432 : x - Step 2: Convert to fraction form
919.62/1,378.26 = 432/x - Step 3: Cross multiply
919.62x = 1,378.26 × 432 - Step 4: Simplify right side
919.62x = 595,408.32 - Step 5: Solve for x
x = 595,408.32/919.62 - Step 6: Final answer
x = 647.45
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.