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Finding the Fourth Proportional to 13,873.20, 20,809.80 and 5,108.40

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Solution

The fourth proportional to 13,873.20, 20,809.80 and 5,108.40 is: 7,662.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,873.20 : 20,809.80 = 5,108.40 : x
  2. Step 2: Convert to fraction form
    13,873.20/20,809.80 = 5,108.40/x
  3. Step 3: Cross multiply
    13,873.20x = 20,809.80 × 5,108.40
  4. Step 4: Simplify right side
    13,873.20x = 106,304,782.32
  5. Step 5: Solve for x
    x = 106,304,782.32/13,873.20
  6. Step 6: Final answer
    x = 7,662.60

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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.