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Finding the Fourth Proportional to 43,408.40, 65,112.60 and 39,390.80

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Solution

The fourth proportional to 43,408.40, 65,112.60 and 39,390.80 is: 59,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,408.40 : 65,112.60 = 39,390.80 : x
  2. Step 2: Convert to fraction form
    43,408.40/65,112.60 = 39,390.80/x
  3. Step 3: Cross multiply
    43,408.40x = 65,112.60 × 39,390.80
  4. Step 4: Simplify right side
    43,408.40x = 2,564,837,404.08
  5. Step 5: Solve for x
    x = 2,564,837,404.08/43,408.40
  6. Step 6: Final answer
    x = 59,086.20

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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.