Finding the Fourth Proportional to 1,252,457,878.48, 1,728,692,893.11 and 716,919,987.31
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Solution
The fourth proportional to 1,252,457,878.48, 1,728,692,893.11 and 716,919,987.31 is: 989,521,889.95
Step by Step Solution
- Step 1: Write the proportion equation
1,252,457,878.48 : 1,728,692,893.11 = 716,919,987.31 : x - Step 2: Convert to fraction form
1,252,457,878.48/1,728,692,893.11 = 716,919,987.31/x - Step 3: Cross multiply
1,252,457,878.48x = 1,728,692,893.11 × 716,919,987.31 - Step 4: Simplify right side
1,252,457,878.48x = 1,239,334,486,991,308,288 - Step 5: Solve for x
x = 1,239,334,486,991,308,288/1,252,457,878.48 - Step 6: Final answer
x = 989,521,889.95
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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.