Home / 20,830.32-28,744.92-11,399.28

Finding the Fourth Proportional to 20,830.32, 28,744.92 and 11,399.28

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Solution

The fourth proportional to 20,830.32, 28,744.92 and 11,399.28 is: 15,730.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.32 : 28,744.92 = 11,399.28 : x
  2. Step 2: Convert to fraction form
    20,830.32/28,744.92 = 11,399.28/x
  3. Step 3: Cross multiply
    20,830.32x = 28,744.92 × 11,399.28
  4. Step 4: Simplify right side
    20,830.32x = 327,671,391.66
  5. Step 5: Solve for x
    x = 327,671,391.66/20,830.32
  6. Step 6: Final answer
    x = 15,730.50

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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.