Finding the Fourth Proportional to 128,742,611.20, 193,337,865.60 and 68,276,435.20
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Solution
The fourth proportional to 128,742,611.20, 193,337,865.60 and 68,276,435.20 is: 102,533,420.20
Step by Step Solution
- Step 1: Write the proportion equation
128,742,611.20 : 193,337,865.60 = 68,276,435.20 : x - Step 2: Convert to fraction form
128,742,611.20/193,337,865.60 = 68,276,435.20/x - Step 3: Cross multiply
128,742,611.20x = 193,337,865.60 × 68,276,435.20 - Step 4: Simplify right side
128,742,611.20x = 13,200,420,252,344,710 - Step 5: Solve for x
x = 13,200,420,252,344,710/128,742,611.20 - Step 6: Final answer
x = 102,533,420.20
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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.