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Finding the Fourth Proportional to 20,408.60, 30,588.60 and 10,542.80

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Solution

The fourth proportional to 20,408.60, 30,588.60 and 10,542.80 is: 15,801.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,408.60 : 30,588.60 = 10,542.80 : x
  2. Step 2: Convert to fraction form
    20,408.60/30,588.60 = 10,542.80/x
  3. Step 3: Cross multiply
    20,408.60x = 30,588.60 × 10,542.80
  4. Step 4: Simplify right side
    20,408.60x = 322,489,492.08
  5. Step 5: Solve for x
    x = 322,489,492.08/20,408.60
  6. Step 6: Final answer
    x = 15,801.65

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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.