Home / 20,382.20-28,128.78-11,430.28

Finding the Fourth Proportional to 20,382.20, 28,128.78 and 11,430.28

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Solution

The fourth proportional to 20,382.20, 28,128.78 and 11,430.28 is: 15,774.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,382.20 : 28,128.78 = 11,430.28 : x
  2. Step 2: Convert to fraction form
    20,382.20/28,128.78 = 11,430.28/x
  3. Step 3: Cross multiply
    20,382.20x = 28,128.78 × 11,430.28
  4. Step 4: Simplify right side
    20,382.20x = 321,519,831.46
  5. Step 5: Solve for x
    x = 321,519,831.46/20,382.20
  6. Step 6: Final answer
    x = 15,774.54

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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.