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Finding the Fourth Proportional to 13,709.38, 18,915.06 and 8,605.54

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Solution

The fourth proportional to 13,709.38, 18,915.06 and 8,605.54 is: 11,873.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,709.38 : 18,915.06 = 8,605.54 : x
  2. Step 2: Convert to fraction form
    13,709.38/18,915.06 = 8,605.54/x
  3. Step 3: Cross multiply
    13,709.38x = 18,915.06 × 8,605.54
  4. Step 4: Simplify right side
    13,709.38x = 162,774,305.43
  5. Step 5: Solve for x
    x = 162,774,305.43/13,709.38
  6. Step 6: Final answer
    x = 11,873.21

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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.