Finding the Fourth Proportional to 128,071.79, 176,722.76 and 71,485.55
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Solution
The fourth proportional to 128,071.79, 176,722.76 and 71,485.55 is: 98,640.95
Step by Step Solution
- Step 1: Write the proportion equation
128,071.79 : 176,722.76 = 71,485.55 : x - Step 2: Convert to fraction form
128,071.79/176,722.76 = 71,485.55/x - Step 3: Cross multiply
128,071.79x = 176,722.76 × 71,485.55 - Step 4: Simplify right side
128,071.79x = 12,633,122,455.08 - Step 5: Solve for x
x = 12,633,122,455.08/128,071.79 - Step 6: Final answer
x = 98,640.95
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1.5x scale
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.