Finding the Fourth Proportional to 687,703.80, 1,031,555.70 and 421,764.60
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Solution
The fourth proportional to 687,703.80, 1,031,555.70 and 421,764.60 is: 632,646.90
Step by Step Solution
- Step 1: Write the proportion equation
687,703.80 : 1,031,555.70 = 421,764.60 : x - Step 2: Convert to fraction form
687,703.80/1,031,555.70 = 421,764.60/x - Step 3: Cross multiply
687,703.80x = 1,031,555.70 × 421,764.60 - Step 4: Simplify right side
687,703.80x = 435,073,677,188.22 - Step 5: Solve for x
x = 435,073,677,188.22/687,703.80 - Step 6: Final answer
x = 632,646.90
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1.5x scale
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.