Finding the Fourth Proportional to 643,081,642.70, 887,125,459.66 and 420,193,625.18
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Solution
The fourth proportional to 643,081,642.70, 887,125,459.66 and 420,193,625.18 is: 579,653,403.44
Step by Step Solution
- Step 1: Write the proportion equation
643,081,642.70 : 887,125,459.66 = 420,193,625.18 : x - Step 2: Convert to fraction form
643,081,642.70/887,125,459.66 = 420,193,625.18/x - Step 3: Cross multiply
643,081,642.70x = 887,125,459.66 × 420,193,625.18 - Step 4: Simplify right side
643,081,642.70x = 372,764,462,878,523,136 - Step 5: Solve for x
x = 372,764,462,878,523,136/643,081,642.70 - Step 6: Final answer
x = 579,653,403.44
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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.