Home / 13,720.64-20,480.56-11,785.28

Finding the Fourth Proportional to 13,720.64, 20,480.56 and 11,785.28

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Solution

The fourth proportional to 13,720.64, 20,480.56 and 11,785.28 is: 17,591.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.64 : 20,480.56 = 11,785.28 : x
  2. Step 2: Convert to fraction form
    13,720.64/20,480.56 = 11,785.28/x
  3. Step 3: Cross multiply
    13,720.64x = 20,480.56 × 11,785.28
  4. Step 4: Simplify right side
    13,720.64x = 241,369,134.16
  5. Step 5: Solve for x
    x = 241,369,134.16/13,720.64
  6. Step 6: Final answer
    x = 17,591.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.