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Finding the Fourth Proportional to 18,887.28, 28,331.84 and 5,739.80

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Solution

The fourth proportional to 18,887.28, 28,331.84 and 5,739.80 is: 8,609.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,887.28 : 28,331.84 = 5,739.80 : x
  2. Step 2: Convert to fraction form
    18,887.28/28,331.84 = 5,739.80/x
  3. Step 3: Cross multiply
    18,887.28x = 28,331.84 × 5,739.80
  4. Step 4: Simplify right side
    18,887.28x = 162,619,095.23
  5. Step 5: Solve for x
    x = 162,619,095.23/18,887.28
  6. Step 6: Final answer
    x = 8,609.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.