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Finding the Fourth Proportional to 13,709.65, 18,920.60 and 8,330.85

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Solution

The fourth proportional to 13,709.65, 18,920.60 and 8,330.85 is: 11,497.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,709.65 : 18,920.60 = 8,330.85 : x
  2. Step 2: Convert to fraction form
    13,709.65/18,920.60 = 8,330.85/x
  3. Step 3: Cross multiply
    13,709.65x = 18,920.60 × 8,330.85
  4. Step 4: Simplify right side
    13,709.65x = 157,624,573.11
  5. Step 5: Solve for x
    x = 157,624,573.11/13,709.65
  6. Step 6: Final answer
    x = 11,497.34

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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.