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Finding the Fourth Proportional to 20,801.60, 31,202.40 and 20,412.80

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Solution

The fourth proportional to 20,801.60, 31,202.40 and 20,412.80 is: 30,619.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.60 : 31,202.40 = 20,412.80 : x
  2. Step 2: Convert to fraction form
    20,801.60/31,202.40 = 20,412.80/x
  3. Step 3: Cross multiply
    20,801.60x = 31,202.40 × 20,412.80
  4. Step 4: Simplify right side
    20,801.60x = 636,928,350.72
  5. Step 5: Solve for x
    x = 636,928,350.72/20,801.60
  6. Step 6: Final answer
    x = 30,619.20

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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.