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Finding the Fourth Proportional to 19,359.80, 29,039.70 and 13,722.20

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Solution

The fourth proportional to 19,359.80, 29,039.70 and 13,722.20 is: 20,583.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,359.80 : 29,039.70 = 13,722.20 : x
  2. Step 2: Convert to fraction form
    19,359.80/29,039.70 = 13,722.20/x
  3. Step 3: Cross multiply
    19,359.80x = 29,039.70 × 13,722.20
  4. Step 4: Simplify right side
    19,359.80x = 398,488,571.34
  5. Step 5: Solve for x
    x = 398,488,571.34/19,359.80
  6. Step 6: Final answer
    x = 20,583.30

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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.