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Finding the Fourth Proportional to 20,720.60, 31,080.90 and 6,869.60

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Solution

The fourth proportional to 20,720.60, 31,080.90 and 6,869.60 is: 10,304.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.60 : 31,080.90 = 6,869.60 : x
  2. Step 2: Convert to fraction form
    20,720.60/31,080.90 = 6,869.60/x
  3. Step 3: Cross multiply
    20,720.60x = 31,080.90 × 6,869.60
  4. Step 4: Simplify right side
    20,720.60x = 213,513,350.64
  5. Step 5: Solve for x
    x = 213,513,350.64/20,720.60
  6. Step 6: Final answer
    x = 10,304.40

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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.