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Finding the Fourth Proportional to 20,325.60, 30,488.40 and 20,131.20

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Solution

The fourth proportional to 20,325.60, 30,488.40 and 20,131.20 is: 30,196.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,325.60 : 30,488.40 = 20,131.20 : x
  2. Step 2: Convert to fraction form
    20,325.60/30,488.40 = 20,131.20/x
  3. Step 3: Cross multiply
    20,325.60x = 30,488.40 × 20,131.20
  4. Step 4: Simplify right side
    20,325.60x = 613,768,078.08
  5. Step 5: Solve for x
    x = 613,768,078.08/20,325.60
  6. Step 6: Final answer
    x = 30,196.80

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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.