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Finding the Fourth Proportional to 20,806.60, 31,209.90 and 20,612.20

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Solution

The fourth proportional to 20,806.60, 31,209.90 and 20,612.20 is: 30,918.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.60 : 31,209.90 = 20,612.20 : x
  2. Step 2: Convert to fraction form
    20,806.60/31,209.90 = 20,612.20/x
  3. Step 3: Cross multiply
    20,806.60x = 31,209.90 × 20,612.20
  4. Step 4: Simplify right side
    20,806.60x = 643,304,700.78
  5. Step 5: Solve for x
    x = 643,304,700.78/20,806.60
  6. Step 6: Final answer
    x = 30,918.30

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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.