Home / 20,383.40-28,128.76-11,430.88

Finding the Fourth Proportional to 20,383.40, 28,128.76 and 11,430.88

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Solution

The fourth proportional to 20,383.40, 28,128.76 and 11,430.88 is: 15,774.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,383.40 : 28,128.76 = 11,430.88 : x
  2. Step 2: Convert to fraction form
    20,383.40/28,128.76 = 11,430.88/x
  3. Step 3: Cross multiply
    20,383.40x = 28,128.76 × 11,430.88
  4. Step 4: Simplify right side
    20,383.40x = 321,536,480.11
  5. Step 5: Solve for x
    x = 321,536,480.11/20,383.40
  6. Step 6: Final answer
    x = 15,774.43

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Half scale
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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.