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Finding the Fourth Proportional to 13,813.44, 20,728.80 and 5,605.44

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Solution

The fourth proportional to 13,813.44, 20,728.80 and 5,605.44 is: 8,411.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,813.44 : 20,728.80 = 5,605.44 : x
  2. Step 2: Convert to fraction form
    13,813.44/20,728.80 = 5,605.44/x
  3. Step 3: Cross multiply
    13,813.44x = 20,728.80 × 5,605.44
  4. Step 4: Simplify right side
    13,813.44x = 116,194,044.67
  5. Step 5: Solve for x
    x = 116,194,044.67/13,813.44
  6. Step 6: Final answer
    x = 8,411.67

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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.