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Finding the Fourth Proportional to 39,028.60, 53,859.04 and 21,123.20

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Solution

The fourth proportional to 39,028.60, 53,859.04 and 21,123.20 is: 29,149.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,028.60 : 53,859.04 = 21,123.20 : x
  2. Step 2: Convert to fraction form
    39,028.60/53,859.04 = 21,123.20/x
  3. Step 3: Cross multiply
    39,028.60x = 53,859.04 × 21,123.20
  4. Step 4: Simplify right side
    39,028.60x = 1,137,675,273.73
  5. Step 5: Solve for x
    x = 1,137,675,273.73/39,028.60
  6. Step 6: Final answer
    x = 29,149.78

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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.