Finding the Fourth Proportional to 8,487,639.70, 12,731,459.55 and 5,128,407.70
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Solution
The fourth proportional to 8,487,639.70, 12,731,459.55 and 5,128,407.70 is: 7,692,611.55
Step by Step Solution
- Step 1: Write the proportion equation
8,487,639.70 : 12,731,459.55 = 5,128,407.70 : x - Step 2: Convert to fraction form
8,487,639.70/12,731,459.55 = 5,128,407.70/x - Step 3: Cross multiply
8,487,639.70x = 12,731,459.55 × 5,128,407.70 - Step 4: Simplify right side
8,487,639.70x = 65,292,115,188,458.54 - Step 5: Solve for x
x = 65,292,115,188,458.54/8,487,639.70 - Step 6: Final answer
x = 7,692,611.55
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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.