Finding the Fourth Proportional to 1,398,319,324,621.20, 1,929,660,131,621.90 and 781,031,051,169.40
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Solution
The fourth proportional to 1,398,319,324,621.20, 1,929,660,131,621.90 and 781,031,051,169.40 is: 1,077,811,380,035.54
Step by Step Solution
- Step 1: Write the proportion equation
1,398,319,324,621.20 : 1,929,660,131,621.90 = 781,031,051,169.40 : x - Step 2: Convert to fraction form
1,398,319,324,621.20/1,929,660,131,621.90 = 781,031,051,169.40/x - Step 3: Cross multiply
1,398,319,324,621.20x = 1,929,660,131,621.90 × 781,031,051,169.40 - Step 4: Simplify right side
1,398,319,324,621.20x = 1,507,124,481,000,335,187,378,176 - Step 5: Solve for x
x = 1,507,124,481,000,335,187,378,176/1,398,319,324,621.20 - Step 6: Final answer
x = 1,077,811,380,035.54
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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.