Home / 28,391.11-39,180.51-15,815.86

Finding the Fourth Proportional to 28,391.11, 39,180.51 and 15,815.86

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Solution

The fourth proportional to 28,391.11, 39,180.51 and 15,815.86 is: 21,826.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,391.11 : 39,180.51 = 15,815.86 : x
  2. Step 2: Convert to fraction form
    28,391.11/39,180.51 = 15,815.86/x
  3. Step 3: Cross multiply
    28,391.11x = 39,180.51 × 15,815.86
  4. Step 4: Simplify right side
    28,391.11x = 619,673,362.94
  5. Step 5: Solve for x
    x = 619,673,362.94/28,391.11
  6. Step 6: Final answer
    x = 21,826.32

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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.