Home / 20,385.44-28,132.64-11,432.96

Finding the Fourth Proportional to 20,385.44, 28,132.64 and 11,432.96

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Solution

The fourth proportional to 20,385.44, 28,132.64 and 11,432.96 is: 15,777.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.44 : 28,132.64 = 11,432.96 : x
  2. Step 2: Convert to fraction form
    20,385.44/28,132.64 = 11,432.96/x
  3. Step 3: Cross multiply
    20,385.44x = 28,132.64 × 11,432.96
  4. Step 4: Simplify right side
    20,385.44x = 321,639,347.81
  5. Step 5: Solve for x
    x = 321,639,347.81/20,385.44
  6. Step 6: Final answer
    x = 15,777.90

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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.