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Finding the Fourth Proportional to 43,739.20, 65,608.80 and 12,149.20

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Solution

The fourth proportional to 43,739.20, 65,608.80 and 12,149.20 is: 18,223.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,739.20 : 65,608.80 = 12,149.20 : x
  2. Step 2: Convert to fraction form
    43,739.20/65,608.80 = 12,149.20/x
  3. Step 3: Cross multiply
    43,739.20x = 65,608.80 × 12,149.20
  4. Step 4: Simplify right side
    43,739.20x = 797,094,432.96
  5. Step 5: Solve for x
    x = 797,094,432.96/43,739.20
  6. Step 6: Final answer
    x = 18,223.80

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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.