Finding the Fourth Proportional to 1,278,553,358.80, 1,917,830,038.20 and 460,692,341.20
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Solution
The fourth proportional to 1,278,553,358.80, 1,917,830,038.20 and 460,692,341.20 is: 691,038,511.80
Step by Step Solution
- Step 1: Write the proportion equation
1,278,553,358.80 : 1,917,830,038.20 = 460,692,341.20 : x - Step 2: Convert to fraction form
1,278,553,358.80/1,917,830,038.20 = 460,692,341.20/x - Step 3: Cross multiply
1,278,553,358.80x = 1,917,830,038.20 × 460,692,341.20 - Step 4: Simplify right side
1,278,553,358.80x = 883,529,610,322,043,392 - Step 5: Solve for x
x = 883,529,610,322,043,392/1,278,553,358.80 - Step 6: Final answer
x = 691,038,511.80
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Double scale
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Similar ratio
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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.