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Finding the Fourth Proportional to 18,989.35, 28,494.24 and 7,903.69

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Solution

The fourth proportional to 18,989.35, 28,494.24 and 7,903.69 is: 11,859.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.35 : 28,494.24 = 7,903.69 : x
  2. Step 2: Convert to fraction form
    18,989.35/28,494.24 = 7,903.69/x
  3. Step 3: Cross multiply
    18,989.35x = 28,494.24 × 7,903.69
  4. Step 4: Simplify right side
    18,989.35x = 225,209,639.75
  5. Step 5: Solve for x
    x = 225,209,639.75/18,989.35
  6. Step 6: Final answer
    x = 11,859.79

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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.