Home / 39,789-54,910.20-21,885.36

Finding the Fourth Proportional to 39,789, 54,910.20 and 21,885.36

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Solution

The fourth proportional to 39,789, 54,910.20 and 21,885.36 is: 30,202.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,789 : 54,910.20 = 21,885.36 : x
  2. Step 2: Convert to fraction form
    39,789/54,910.20 = 21,885.36/x
  3. Step 3: Cross multiply
    39,789x = 54,910.20 × 21,885.36
  4. Step 4: Simplify right side
    39,789x = 1,201,729,494.67
  5. Step 5: Solve for x
    x = 1,201,729,494.67/39,789
  6. Step 6: Final answer
    x = 30,202.56

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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.