Finding the Fourth Proportional to 139,408,987.20, 209,113,480.80 and 133,138,420.80
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Solution
The fourth proportional to 139,408,987.20, 209,113,480.80 and 133,138,420.80 is: 199,707,631.20
Step by Step Solution
- Step 1: Write the proportion equation
139,408,987.20 : 209,113,480.80 = 133,138,420.80 : x - Step 2: Convert to fraction form
139,408,987.20/209,113,480.80 = 133,138,420.80/x - Step 3: Cross multiply
139,408,987.20x = 209,113,480.80 × 133,138,420.80 - Step 4: Simplify right side
139,408,987.20x = 27,841,038,601,703,120 - Step 5: Solve for x
x = 27,841,038,601,703,120/139,408,987.20 - Step 6: Final answer
x = 199,707,631.20
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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.