Finding the Fourth Proportional to 20,986,421.05, 28,960,873.03 and 11,438,785.65
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Solution
The fourth proportional to 20,986,421.05, 28,960,873.03 and 11,438,785.65 is: 15,785,312.70
Step by Step Solution
- Step 1: Write the proportion equation
20,986,421.05 : 28,960,873.03 = 11,438,785.65 : x - Step 2: Convert to fraction form
20,986,421.05/28,960,873.03 = 11,438,785.65/x - Step 3: Cross multiply
20,986,421.05x = 28,960,873.03 × 11,438,785.65 - Step 4: Simplify right side
20,986,421.05x = 331,277,218,843,633.38 - Step 5: Solve for x
x = 331,277,218,843,633.38/20,986,421.05 - Step 6: Final answer
x = 15,785,312.70
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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.