Finding the Fourth Proportional to 128,487.40, 177,313.06 and 71,898.68
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Solution
The fourth proportional to 128,487.40, 177,313.06 and 71,898.68 is: 99,220.43
Step by Step Solution
- Step 1: Write the proportion equation
128,487.40 : 177,313.06 = 71,898.68 : x - Step 2: Convert to fraction form
128,487.40/177,313.06 = 71,898.68/x - Step 3: Cross multiply
128,487.40x = 177,313.06 × 71,898.68 - Step 4: Simplify right side
128,487.40x = 12,748,574,960.76 - Step 5: Solve for x
x = 12,748,574,960.76/128,487.40 - Step 6: Final answer
x = 99,220.43
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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.