Finding the Fourth Proportional to 1,278,794,373.80, 1,918,191,560.70 and 865,545,852.20
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Solution
The fourth proportional to 1,278,794,373.80, 1,918,191,560.70 and 865,545,852.20 is: 1,298,318,778.30
Step by Step Solution
- Step 1: Write the proportion equation
1,278,794,373.80 : 1,918,191,560.70 = 865,545,852.20 : x - Step 2: Convert to fraction form
1,278,794,373.80/1,918,191,560.70 = 865,545,852.20/x - Step 3: Cross multiply
1,278,794,373.80x = 1,918,191,560.70 × 865,545,852.20 - Step 4: Simplify right side
1,278,794,373.80x = 1,660,282,749,088,929,536 - Step 5: Solve for x
x = 1,660,282,749,088,929,536/1,278,794,373.80 - Step 6: Final answer
x = 1,298,318,778.30
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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.