Finding the Fourth Proportional to 157,378.09, 217,178.94 and 85,758.70
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Solution
The fourth proportional to 157,378.09, 217,178.94 and 85,758.70 is: 118,345.47
Step by Step Solution
- Step 1: Write the proportion equation
157,378.09 : 217,178.94 = 85,758.70 : x - Step 2: Convert to fraction form
157,378.09/217,178.94 = 85,758.70/x - Step 3: Cross multiply
157,378.09x = 217,178.94 × 85,758.70 - Step 4: Simplify right side
157,378.09x = 18,624,983,561.78 - Step 5: Solve for x
x = 18,624,983,561.78/157,378.09 - Step 6: Final answer
x = 118,345.47
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1.5x scale
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.