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Finding the Fourth Proportional to 21,408.60, 32,112.90 and 21,408.60

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Solution

The fourth proportional to 21,408.60, 32,112.90 and 21,408.60 is: 32,112.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,408.60 : 32,112.90 = 21,408.60 : x
  2. Step 2: Convert to fraction form
    21,408.60/32,112.90 = 21,408.60/x
  3. Step 3: Cross multiply
    21,408.60x = 32,112.90 × 21,408.60
  4. Step 4: Simplify right side
    21,408.60x = 687,492,230.94
  5. Step 5: Solve for x
    x = 687,492,230.94/21,408.60
  6. Step 6: Final answer
    x = 32,112.90

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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.