Home / 28,361.12-39,137.68-15,785.60

Finding the Fourth Proportional to 28,361.12, 39,137.68 and 15,785.60

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Solution

The fourth proportional to 28,361.12, 39,137.68 and 15,785.60 is: 21,783.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,361.12 : 39,137.68 = 15,785.60 : x
  2. Step 2: Convert to fraction form
    28,361.12/39,137.68 = 15,785.60/x
  3. Step 3: Cross multiply
    28,361.12x = 39,137.68 × 15,785.60
  4. Step 4: Simplify right side
    28,361.12x = 617,811,761.41
  5. Step 5: Solve for x
    x = 617,811,761.41/28,361.12
  6. Step 6: Final answer
    x = 21,783.76

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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.