Finding the Fourth Proportional to 1,289,394,209.45, 1,779,346,988.21 and 717,173,403.05
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Solution
The fourth proportional to 1,289,394,209.45, 1,779,346,988.21 and 717,173,403.05 is: 989,689,829.06
Step by Step Solution
- Step 1: Write the proportion equation
1,289,394,209.45 : 1,779,346,988.21 = 717,173,403.05 : x - Step 2: Convert to fraction form
1,289,394,209.45/1,779,346,988.21 = 717,173,403.05/x - Step 3: Cross multiply
1,289,394,209.45x = 1,779,346,988.21 × 717,173,403.05 - Step 4: Simplify right side
1,289,394,209.45x = 1,276,100,334,741,333,760 - Step 5: Solve for x
x = 1,276,100,334,741,333,760/1,289,394,209.45 - Step 6: Final answer
x = 989,689,829.06
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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.