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Finding the Fourth Proportional to 18,487.94, 27,720.80 and 7,229.86

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Solution

The fourth proportional to 18,487.94, 27,720.80 and 7,229.86 is: 10,840.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,487.94 : 27,720.80 = 7,229.86 : x
  2. Step 2: Convert to fraction form
    18,487.94/27,720.80 = 7,229.86/x
  3. Step 3: Cross multiply
    18,487.94x = 27,720.80 × 7,229.86
  4. Step 4: Simplify right side
    18,487.94x = 200,417,580.68
  5. Step 5: Solve for x
    x = 200,417,580.68/18,487.94
  6. Step 6: Final answer
    x = 10,840.45

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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.