Finding the Fourth Proportional to 318,955.20, 478,432.80 and 129,415.20
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Solution
The fourth proportional to 318,955.20, 478,432.80 and 129,415.20 is: 194,122.80
Step by Step Solution
- Step 1: Write the proportion equation
318,955.20 : 478,432.80 = 129,415.20 : x - Step 2: Convert to fraction form
318,955.20/478,432.80 = 129,415.20/x - Step 3: Cross multiply
318,955.20x = 478,432.80 × 129,415.20 - Step 4: Simplify right side
318,955.20x = 61,916,476,498.56 - Step 5: Solve for x
x = 61,916,476,498.56/318,955.20 - Step 6: Final answer
x = 194,122.80
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1.5x scale
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.