Home / 28,320.12-39,081.96-15,745.68

Finding the Fourth Proportional to 28,320.12, 39,081.96 and 15,745.68

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Solution

The fourth proportional to 28,320.12, 39,081.96 and 15,745.68 is: 21,729.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,320.12 : 39,081.96 = 15,745.68 : x
  2. Step 2: Convert to fraction form
    28,320.12/39,081.96 = 15,745.68/x
  3. Step 3: Cross multiply
    28,320.12x = 39,081.96 × 15,745.68
  4. Step 4: Simplify right side
    28,320.12x = 615,372,035.93
  5. Step 5: Solve for x
    x = 615,372,035.93/28,320.12
  6. Step 6: Final answer
    x = 21,729.15

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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.