Finding the Fourth Proportional to 128,707.98, 177,420.12 and 90,359.95
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Solution
The fourth proportional to 128,707.98, 177,420.12 and 90,359.95 is: 124,558.50
Step by Step Solution
- Step 1: Write the proportion equation
128,707.98 : 177,420.12 = 90,359.95 : x - Step 2: Convert to fraction form
128,707.98/177,420.12 = 90,359.95/x - Step 3: Cross multiply
128,707.98x = 177,420.12 × 90,359.95 - Step 4: Simplify right side
128,707.98x = 16,031,672,954.54 - Step 5: Solve for x
x = 16,031,672,954.54/128,707.98 - Step 6: Final answer
x = 124,558.50
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.