Home / 21,357.28-29,469.72-12,858.76

Finding the Fourth Proportional to 21,357.28, 29,469.72 and 12,858.76

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Solution

The fourth proportional to 21,357.28, 29,469.72 and 12,858.76 is: 17,743.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,357.28 : 29,469.72 = 12,858.76 : x
  2. Step 2: Convert to fraction form
    21,357.28/29,469.72 = 12,858.76/x
  3. Step 3: Cross multiply
    21,357.28x = 29,469.72 × 12,858.76
  4. Step 4: Simplify right side
    21,357.28x = 378,944,056.75
  5. Step 5: Solve for x
    x = 378,944,056.75/21,357.28
  6. Step 6: Final answer
    x = 17,743.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.