Finding the Fourth Proportional to 128,012.40, 176,631.84 and 71,412.84
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Solution
The fourth proportional to 128,012.40, 176,631.84 and 71,412.84 is: 98,535.62
Step by Step Solution
- Step 1: Write the proportion equation
128,012.40 : 176,631.84 = 71,412.84 : x - Step 2: Convert to fraction form
128,012.40/176,631.84 = 71,412.84/x - Step 3: Cross multiply
128,012.40x = 176,631.84 × 71,412.84 - Step 4: Simplify right side
128,012.40x = 12,613,781,328.83 - Step 5: Solve for x
x = 12,613,781,328.83/128,012.40 - Step 6: Final answer
x = 98,535.62
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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.