Home / 20,383.20-28,128.12-11,432.16

Finding the Fourth Proportional to 20,383.20, 28,128.12 and 11,432.16

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Solution

The fourth proportional to 20,383.20, 28,128.12 and 11,432.16 is: 15,775.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,383.20 : 28,128.12 = 11,432.16 : x
  2. Step 2: Convert to fraction form
    20,383.20/28,128.12 = 11,432.16/x
  3. Step 3: Cross multiply
    20,383.20x = 28,128.12 × 11,432.16
  4. Step 4: Simplify right side
    20,383.20x = 321,565,168.34
  5. Step 5: Solve for x
    x = 321,565,168.34/20,383.20
  6. Step 6: Final answer
    x = 15,775.99

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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.