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Finding the Fourth Proportional to 21,408.40, 32,112.60 and 13,651.60

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Solution

The fourth proportional to 21,408.40, 32,112.60 and 13,651.60 is: 20,477.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,408.40 : 32,112.60 = 13,651.60 : x
  2. Step 2: Convert to fraction form
    21,408.40/32,112.60 = 13,651.60/x
  3. Step 3: Cross multiply
    21,408.40x = 32,112.60 × 13,651.60
  4. Step 4: Simplify right side
    21,408.40x = 438,388,370.16
  5. Step 5: Solve for x
    x = 438,388,370.16/21,408.40
  6. Step 6: Final answer
    x = 20,477.40

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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.