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Finding the Fourth Proportional to 20,720.60, 31,080.90 and 19,914.20

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Solution

The fourth proportional to 20,720.60, 31,080.90 and 19,914.20 is: 29,871.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.60 : 31,080.90 = 19,914.20 : x
  2. Step 2: Convert to fraction form
    20,720.60/31,080.90 = 19,914.20/x
  3. Step 3: Cross multiply
    20,720.60x = 31,080.90 × 19,914.20
  4. Step 4: Simplify right side
    20,720.60x = 618,951,258.78
  5. Step 5: Solve for x
    x = 618,951,258.78/20,720.60
  6. Step 6: Final answer
    x = 29,871.30

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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.