Finding the Fourth Proportional to 687,685,612.80, 1,031,528,419.20 and 647,341,651.20
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Solution
The fourth proportional to 687,685,612.80, 1,031,528,419.20 and 647,341,651.20 is: 971,012,476.80
Step by Step Solution
- Step 1: Write the proportion equation
687,685,612.80 : 1,031,528,419.20 = 647,341,651.20 : x - Step 2: Convert to fraction form
687,685,612.80/1,031,528,419.20 = 647,341,651.20/x - Step 3: Cross multiply
687,685,612.80x = 1,031,528,419.20 × 647,341,651.20 - Step 4: Simplify right side
687,685,612.80x = 667,751,310,144,653,824 - Step 5: Solve for x
x = 667,751,310,144,653,824/687,685,612.80 - Step 6: Final answer
x = 971,012,476.80
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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.