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Finding the Fourth Proportional to 20,491.68, 30,707.76 and 11,123.76

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Solution

The fourth proportional to 20,491.68, 30,707.76 and 11,123.76 is: 16,669.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.68 : 30,707.76 = 11,123.76 : x
  2. Step 2: Convert to fraction form
    20,491.68/30,707.76 = 11,123.76/x
  3. Step 3: Cross multiply
    20,491.68x = 30,707.76 × 11,123.76
  4. Step 4: Simplify right side
    20,491.68x = 341,585,752.38
  5. Step 5: Solve for x
    x = 341,585,752.38/20,491.68
  6. Step 6: Final answer
    x = 16,669.48

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1.5x scale

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.