Home / 28,390.44-39,180.78-15,815.64

Finding the Fourth Proportional to 28,390.44, 39,180.78 and 15,815.64

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Solution

The fourth proportional to 28,390.44, 39,180.78 and 15,815.64 is: 21,826.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,390.44 : 39,180.78 = 15,815.64 : x
  2. Step 2: Convert to fraction form
    28,390.44/39,180.78 = 15,815.64/x
  3. Step 3: Cross multiply
    28,390.44x = 39,180.78 × 15,815.64
  4. Step 4: Simplify right side
    28,390.44x = 619,669,111.40
  5. Step 5: Solve for x
    x = 619,669,111.40/28,390.44
  6. Step 6: Final answer
    x = 21,826.68

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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.