Home / 28,359.72-39,135.78-15,785.64

Finding the Fourth Proportional to 28,359.72, 39,135.78 and 15,785.64

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Solution

The fourth proportional to 28,359.72, 39,135.78 and 15,785.64 is: 21,783.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,359.72 : 39,135.78 = 15,785.64 : x
  2. Step 2: Convert to fraction form
    28,359.72/39,135.78 = 15,785.64/x
  3. Step 3: Cross multiply
    28,359.72x = 39,135.78 × 15,785.64
  4. Step 4: Simplify right side
    28,359.72x = 617,783,334.20
  5. Step 5: Solve for x
    x = 617,783,334.20/28,359.72
  6. Step 6: Final answer
    x = 21,783.83

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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.