Finding the Fourth Proportional to 212,931.66, 319,861.12 and 128,731.48
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Solution
The fourth proportional to 212,931.66, 319,861.12 and 128,731.48 is: 193,377.52
Step by Step Solution
- Step 1: Write the proportion equation
212,931.66 : 319,861.12 = 128,731.48 : x - Step 2: Convert to fraction form
212,931.66/319,861.12 = 128,731.48/x - Step 3: Cross multiply
212,931.66x = 319,861.12 × 128,731.48 - Step 4: Simplify right side
212,931.66x = 41,176,195,372.06 - Step 5: Solve for x
x = 41,176,195,372.06/212,931.66 - Step 6: Final answer
x = 193,377.52
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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.