Home / 28,535.72-39,380.45-15,788.68

Finding the Fourth Proportional to 28,535.72, 39,380.45 and 15,788.68

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Solution

The fourth proportional to 28,535.72, 39,380.45 and 15,788.68 is: 21,789.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,535.72 : 39,380.45 = 15,788.68 : x
  2. Step 2: Convert to fraction form
    28,535.72/39,380.45 = 15,788.68/x
  3. Step 3: Cross multiply
    28,535.72x = 39,380.45 × 15,788.68
  4. Step 4: Simplify right side
    28,535.72x = 621,765,323.31
  5. Step 5: Solve for x
    x = 621,765,323.31/28,535.72
  6. Step 6: Final answer
    x = 21,789.02

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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.