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Finding the Fourth Proportional to 20,211.64, 27,903.64 and 13,508.62

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Solution

The fourth proportional to 20,211.64, 27,903.64 and 13,508.62 is: 18,649.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,211.64 : 27,903.64 = 13,508.62 : x
  2. Step 2: Convert to fraction form
    20,211.64/27,903.64 = 13,508.62/x
  3. Step 3: Cross multiply
    20,211.64x = 27,903.64 × 13,508.62
  4. Step 4: Simplify right side
    20,211.64x = 376,939,669.38
  5. Step 5: Solve for x
    x = 376,939,669.38/20,211.64
  6. Step 6: Final answer
    x = 18,649.63

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1.5x scale

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.