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Finding the Fourth Proportional to 43,709.60, 65,515.80 and 18,745.40

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Solution

The fourth proportional to 43,709.60, 65,515.80 and 18,745.40 is: 28,097.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,709.60 : 65,515.80 = 18,745.40 : x
  2. Step 2: Convert to fraction form
    43,709.60/65,515.80 = 18,745.40/x
  3. Step 3: Cross multiply
    43,709.60x = 65,515.80 × 18,745.40
  4. Step 4: Simplify right side
    43,709.60x = 1,228,119,877.32
  5. Step 5: Solve for x
    x = 1,228,119,877.32/43,709.60
  6. Step 6: Final answer
    x = 28,097.26

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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.