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Finding the Fourth Proportional to 21,939.58, 32,903.09 and 7,149.79

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Solution

The fourth proportional to 21,939.58, 32,903.09 and 7,149.79 is: 10,722.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.58 : 32,903.09 = 7,149.79 : x
  2. Step 2: Convert to fraction form
    21,939.58/32,903.09 = 7,149.79/x
  3. Step 3: Cross multiply
    21,939.58x = 32,903.09 × 7,149.79
  4. Step 4: Simplify right side
    21,939.58x = 235,250,065.84
  5. Step 5: Solve for x
    x = 235,250,065.84/21,939.58
  6. Step 6: Final answer
    x = 10,722.63

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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.