Finding the Fourth Proportional to 307.18, 423.35 and 287.70
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Solution
The fourth proportional to 307.18, 423.35 and 287.70 is: 396.49
Step by Step Solution
- Step 1: Write the proportion equation
307.18 : 423.35 = 287.70 : x - Step 2: Convert to fraction form
307.18/423.35 = 287.70/x - Step 3: Cross multiply
307.18x = 423.35 × 287.70 - Step 4: Simplify right side
307.18x = 121,794.24 - Step 5: Solve for x
x = 121,794.24/307.18 - Step 6: Final answer
x = 396.49
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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.