Finding the Fourth Proportional to 1,278,139,809.80, 1,917,209,714.70 and 551,128,521.80
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Solution
The fourth proportional to 1,278,139,809.80, 1,917,209,714.70 and 551,128,521.80 is: 826,692,782.70
Step by Step Solution
- Step 1: Write the proportion equation
1,278,139,809.80 : 1,917,209,714.70 = 551,128,521.80 : x - Step 2: Convert to fraction form
1,278,139,809.80/1,917,209,714.70 = 551,128,521.80/x - Step 3: Cross multiply
1,278,139,809.80x = 1,917,209,714.70 × 551,128,521.80 - Step 4: Simplify right side
1,278,139,809.80x = 1,056,628,956,043,210,624 - Step 5: Solve for x
x = 1,056,628,956,043,210,624/1,278,139,809.80 - Step 6: Final answer
x = 826,692,782.70
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Double scale
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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.