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Finding the Fourth Proportional to 13,509.89, 18,640.36 and 7,919.81

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Solution

The fourth proportional to 13,509.89, 18,640.36 and 7,919.81 is: 10,927.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,509.89 : 18,640.36 = 7,919.81 : x
  2. Step 2: Convert to fraction form
    13,509.89/18,640.36 = 7,919.81/x
  3. Step 3: Cross multiply
    13,509.89x = 18,640.36 × 7,919.81
  4. Step 4: Simplify right side
    13,509.89x = 147,628,109.53
  5. Step 5: Solve for x
    x = 147,628,109.53/13,509.89
  6. Step 6: Final answer
    x = 10,927.41

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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.