Finding the Fourth Proportional to 1,211,458,493.80, 1,817,187,740.70 and 393,653,463.40
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Solution
The fourth proportional to 1,211,458,493.80, 1,817,187,740.70 and 393,653,463.40 is: 590,480,195.10
Step by Step Solution
- Step 1: Write the proportion equation
1,211,458,493.80 : 1,817,187,740.70 = 393,653,463.40 : x - Step 2: Convert to fraction form
1,211,458,493.80/1,817,187,740.70 = 393,653,463.40/x - Step 3: Cross multiply
1,211,458,493.80x = 1,817,187,740.70 × 393,653,463.40 - Step 4: Simplify right side
1,211,458,493.80x = 715,342,247,774,576,128 - Step 5: Solve for x
x = 715,342,247,774,576,128/1,211,458,493.80 - Step 6: Final answer
x = 590,480,195.10
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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.