Home / 20,383.76-28,129.60-11,309.74

Finding the Fourth Proportional to 20,383.76, 28,129.60 and 11,309.74

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Solution

The fourth proportional to 20,383.76, 28,129.60 and 11,309.74 is: 15,607.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,383.76 : 28,129.60 = 11,309.74 : x
  2. Step 2: Convert to fraction form
    20,383.76/28,129.60 = 11,309.74/x
  3. Step 3: Cross multiply
    20,383.76x = 28,129.60 × 11,309.74
  4. Step 4: Simplify right side
    20,383.76x = 318,138,462.30
  5. Step 5: Solve for x
    x = 318,138,462.30/20,383.76
  6. Step 6: Final answer
    x = 15,607.45

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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.