Finding the Fourth Proportional to 72,129,134.16, 99,540,612.36 and 39,534,169.68
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Solution
The fourth proportional to 72,129,134.16, 99,540,612.36 and 39,534,169.68 is: 54,558,473.56
Step by Step Solution
- Step 1: Write the proportion equation
72,129,134.16 : 99,540,612.36 = 39,534,169.68 : x - Step 2: Convert to fraction form
72,129,134.16/99,540,612.36 = 39,534,169.68/x - Step 3: Cross multiply
72,129,134.16x = 99,540,612.36 × 39,534,169.68 - Step 4: Simplify right side
72,129,134.16x = 3,935,255,459,091,345 - Step 5: Solve for x
x = 3,935,255,459,091,345/72,129,134.16 - Step 6: Final answer
x = 54,558,473.56
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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.