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Finding the Fourth Proportional to 20,790.50, 28,691.50 and 11,359.67

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Solution

The fourth proportional to 20,790.50, 28,691.50 and 11,359.67 is: 15,676.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.50 : 28,691.50 = 11,359.67 : x
  2. Step 2: Convert to fraction form
    20,790.50/28,691.50 = 11,359.67/x
  3. Step 3: Cross multiply
    20,790.50x = 28,691.50 × 11,359.67
  4. Step 4: Simplify right side
    20,790.50x = 325,925,971.81
  5. Step 5: Solve for x
    x = 325,925,971.81/20,790.50
  6. Step 6: Final answer
    x = 15,676.68

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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.