Home / 20,830.72-28,746.32-11,399.28

Finding the Fourth Proportional to 20,830.72, 28,746.32 and 11,399.28

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Solution

The fourth proportional to 20,830.72, 28,746.32 and 11,399.28 is: 15,730.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.72 : 28,746.32 = 11,399.28 : x
  2. Step 2: Convert to fraction form
    20,830.72/28,746.32 = 11,399.28/x
  3. Step 3: Cross multiply
    20,830.72x = 28,746.32 × 11,399.28
  4. Step 4: Simplify right side
    20,830.72x = 327,687,350.65
  5. Step 5: Solve for x
    x = 327,687,350.65/20,830.72
  6. Step 6: Final answer
    x = 15,730.97

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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.