Finding the Fourth Proportional to 128,929.34, 193,393.75 and 72,743.95
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Solution
The fourth proportional to 128,929.34, 193,393.75 and 72,743.95 is: 109,115.78
Step by Step Solution
- Step 1: Write the proportion equation
128,929.34 : 193,393.75 = 72,743.95 : x - Step 2: Convert to fraction form
128,929.34/193,393.75 = 72,743.95/x - Step 3: Cross multiply
128,929.34x = 193,393.75 × 72,743.95 - Step 4: Simplify right side
128,929.34x = 14,068,225,280.31 - Step 5: Solve for x
x = 14,068,225,280.31/128,929.34 - Step 6: Final answer
x = 109,115.78
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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.