Home / 20,931.33-28,885.25-11,499.90

Finding the Fourth Proportional to 20,931.33, 28,885.25 and 11,499.90

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Solution

The fourth proportional to 20,931.33, 28,885.25 and 11,499.90 is: 15,869.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.33 : 28,885.25 = 11,499.90 : x
  2. Step 2: Convert to fraction form
    20,931.33/28,885.25 = 11,499.90/x
  3. Step 3: Cross multiply
    20,931.33x = 28,885.25 × 11,499.90
  4. Step 4: Simplify right side
    20,931.33x = 332,177,428.98
  5. Step 5: Solve for x
    x = 332,177,428.98/20,931.33
  6. Step 6: Final answer
    x = 15,869.87

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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.