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Finding the Fourth Proportional to 13,679.20, 20,518.80 and 10,223.20

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Solution

The fourth proportional to 13,679.20, 20,518.80 and 10,223.20 is: 15,334.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.20 : 20,518.80 = 10,223.20 : x
  2. Step 2: Convert to fraction form
    13,679.20/20,518.80 = 10,223.20/x
  3. Step 3: Cross multiply
    13,679.20x = 20,518.80 × 10,223.20
  4. Step 4: Simplify right side
    13,679.20x = 209,767,796.16
  5. Step 5: Solve for x
    x = 209,767,796.16/13,679.20
  6. Step 6: Final answer
    x = 15,334.80

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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.