Finding the Fourth Proportional to 918,121.20, 1,377,181.80 and 420,457.20
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Solution
The fourth proportional to 918,121.20, 1,377,181.80 and 420,457.20 is: 630,685.80
Step by Step Solution
- Step 1: Write the proportion equation
918,121.20 : 1,377,181.80 = 420,457.20 : x - Step 2: Convert to fraction form
918,121.20/1,377,181.80 = 420,457.20/x - Step 3: Cross multiply
918,121.20x = 1,377,181.80 × 420,457.20 - Step 4: Simplify right side
918,121.20x = 579,046,003,518.96 - Step 5: Solve for x
x = 579,046,003,518.96/918,121.20 - Step 6: Final answer
x = 630,685.80
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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.