Finding the Fourth Proportional to 1,123.47, 1,685.34 and 392.99
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Solution
The fourth proportional to 1,123.47, 1,685.34 and 392.99 is: 589.52
Step by Step Solution
- Step 1: Write the proportion equation
1,123.47 : 1,685.34 = 392.99 : x - Step 2: Convert to fraction form
1,123.47/1,685.34 = 392.99/x - Step 3: Cross multiply
1,123.47x = 1,685.34 × 392.99 - Step 4: Simplify right side
1,123.47x = 662,313.34 - Step 5: Solve for x
x = 662,313.34/1,123.47 - Step 6: Final answer
x = 589.52
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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.