Finding the Fourth Proportional to 128,948.80, 177,937.44 and 72,349.76
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Solution
The fourth proportional to 128,948.80, 177,937.44 and 72,349.76 is: 99,835.99
Step by Step Solution
- Step 1: Write the proportion equation
128,948.80 : 177,937.44 = 72,349.76 : x - Step 2: Convert to fraction form
128,948.80/177,937.44 = 72,349.76/x - Step 3: Cross multiply
128,948.80x = 177,937.44 × 72,349.76 - Step 4: Simplify right side
128,948.80x = 12,873,731,079.01 - Step 5: Solve for x
x = 12,873,731,079.01/128,948.80 - Step 6: Final answer
x = 99,835.99
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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.