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Finding the Fourth Proportional to 19,489.80, 29,249.10 and 12,913.80

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Solution

The fourth proportional to 19,489.80, 29,249.10 and 12,913.80 is: 19,380.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,489.80 : 29,249.10 = 12,913.80 : x
  2. Step 2: Convert to fraction form
    19,489.80/29,249.10 = 12,913.80/x
  3. Step 3: Cross multiply
    19,489.80x = 29,249.10 × 12,913.80
  4. Step 4: Simplify right side
    19,489.80x = 377,717,027.58
  5. Step 5: Solve for x
    x = 377,717,027.58/19,489.80
  6. Step 6: Final answer
    x = 19,380.24

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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.