Finding the Fourth Proportional to 128,913.99, 177,912.02 and 71,558.70
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Solution
The fourth proportional to 128,913.99, 177,912.02 and 71,558.70 is: 98,756.95
Step by Step Solution
- Step 1: Write the proportion equation
128,913.99 : 177,912.02 = 71,558.70 : x - Step 2: Convert to fraction form
128,913.99/177,912.02 = 71,558.70/x - Step 3: Cross multiply
128,913.99x = 177,912.02 × 71,558.70 - Step 4: Simplify right side
128,913.99x = 12,731,153,044.47 - Step 5: Solve for x
x = 12,731,153,044.47/128,913.99 - Step 6: Final answer
x = 98,756.95
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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.