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Finding the Fourth Proportional to 20,673.65, 28,529.12 and 12,061.49

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Solution

The fourth proportional to 20,673.65, 28,529.12 and 12,061.49 is: 16,644.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,673.65 : 28,529.12 = 12,061.49 : x
  2. Step 2: Convert to fraction form
    20,673.65/28,529.12 = 12,061.49/x
  3. Step 3: Cross multiply
    20,673.65x = 28,529.12 × 12,061.49
  4. Step 4: Simplify right side
    20,673.65x = 344,103,583.10
  5. Step 5: Solve for x
    x = 344,103,583.10/20,673.65
  6. Step 6: Final answer
    x = 16,644.55

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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.