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Finding the Fourth Proportional to 43,603.50, 65,405.87 and 12,438.75

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Solution

The fourth proportional to 43,603.50, 65,405.87 and 12,438.75 is: 18,658.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,603.50 : 65,405.87 = 12,438.75 : x
  2. Step 2: Convert to fraction form
    43,603.50/65,405.87 = 12,438.75/x
  3. Step 3: Cross multiply
    43,603.50x = 65,405.87 × 12,438.75
  4. Step 4: Simplify right side
    43,603.50x = 813,567,203.27
  5. Step 5: Solve for x
    x = 813,567,203.27/43,603.50
  6. Step 6: Final answer
    x = 18,658.30

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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.