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Finding the Fourth Proportional to 13,229.60, 18,256.28 and 7,921.28

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Solution

The fourth proportional to 13,229.60, 18,256.28 and 7,921.28 is: 10,931.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,229.60 : 18,256.28 = 7,921.28 : x
  2. Step 2: Convert to fraction form
    13,229.60/18,256.28 = 7,921.28/x
  3. Step 3: Cross multiply
    13,229.60x = 18,256.28 × 7,921.28
  4. Step 4: Simplify right side
    13,229.60x = 144,613,105.64
  5. Step 5: Solve for x
    x = 144,613,105.64/13,229.60
  6. Step 6: Final answer
    x = 10,931.03

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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.