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Finding the Fourth Proportional to 20,693.66, 28,540.50 and 12,721.64

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Solution

The fourth proportional to 20,693.66, 28,540.50 and 12,721.64 is: 17,545.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,693.66 : 28,540.50 = 12,721.64 : x
  2. Step 2: Convert to fraction form
    20,693.66/28,540.50 = 12,721.64/x
  3. Step 3: Cross multiply
    20,693.66x = 28,540.50 × 12,721.64
  4. Step 4: Simplify right side
    20,693.66x = 363,081,966.42
  5. Step 5: Solve for x
    x = 363,081,966.42/20,693.66
  6. Step 6: Final answer
    x = 17,545.57

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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.