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Finding the Fourth Proportional to 13,720.72, 20,571.72 and 6,601.20

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Solution

The fourth proportional to 13,720.72, 20,571.72 and 6,601.20 is: 9,897.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.72 : 20,571.72 = 6,601.20 : x
  2. Step 2: Convert to fraction form
    13,720.72/20,571.72 = 6,601.20/x
  3. Step 3: Cross multiply
    13,720.72x = 20,571.72 × 6,601.20
  4. Step 4: Simplify right side
    13,720.72x = 135,798,038.06
  5. Step 5: Solve for x
    x = 135,798,038.06/13,720.72
  6. Step 6: Final answer
    x = 9,897.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.