Finding the Fourth Proportional to 1,287,132,353.20, 1,930,698,529.80 and 425,489,345.20
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Solution
The fourth proportional to 1,287,132,353.20, 1,930,698,529.80 and 425,489,345.20 is: 638,234,017.80
Step by Step Solution
- Step 1: Write the proportion equation
1,287,132,353.20 : 1,930,698,529.80 = 425,489,345.20 : x - Step 2: Convert to fraction form
1,287,132,353.20/1,930,698,529.80 = 425,489,345.20/x - Step 3: Cross multiply
1,287,132,353.20x = 1,930,698,529.80 × 425,489,345.20 - Step 4: Simplify right side
1,287,132,353.20x = 821,491,653,223,204,608 - Step 5: Solve for x
x = 821,491,653,223,204,608/1,287,132,353.20 - Step 6: Final answer
x = 638,234,017.80
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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.