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Finding the Fourth Proportional to 13,178.80, 19,720.20 and 9,722.80

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Solution

The fourth proportional to 13,178.80, 19,720.20 and 9,722.80 is: 14,548.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,178.80 : 19,720.20 = 9,722.80 : x
  2. Step 2: Convert to fraction form
    13,178.80/19,720.20 = 9,722.80/x
  3. Step 3: Cross multiply
    13,178.80x = 19,720.20 × 9,722.80
  4. Step 4: Simplify right side
    13,178.80x = 191,735,560.56
  5. Step 5: Solve for x
    x = 191,735,560.56/13,178.80
  6. Step 6: Final answer
    x = 14,548.79

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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.