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Finding the Fourth Proportional to 20,521.65, 30,695.00 and 12,604.71

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Solution

The fourth proportional to 20,521.65, 30,695.00 and 12,604.71 is: 18,853.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,521.65 : 30,695.00 = 12,604.71 : x
  2. Step 2: Convert to fraction form
    20,521.65/30,695.00 = 12,604.71/x
  3. Step 3: Cross multiply
    20,521.65x = 30,695.00 × 12,604.71
  4. Step 4: Simplify right side
    20,521.65x = 386,901,696.43
  5. Step 5: Solve for x
    x = 386,901,696.43/20,521.65
  6. Step 6: Final answer
    x = 18,853.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.