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Finding the Fourth Proportional to 18,989.41, 28,486.39 and 7,903.59

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Solution

The fourth proportional to 18,989.41, 28,486.39 and 7,903.59 is: 11,856.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.41 : 28,486.39 = 7,903.59 : x
  2. Step 2: Convert to fraction form
    18,989.41/28,486.39 = 7,903.59/x
  3. Step 3: Cross multiply
    18,989.41x = 28,486.39 × 7,903.59
  4. Step 4: Simplify right side
    18,989.41x = 225,144,747.14
  5. Step 5: Solve for x
    x = 225,144,747.14/18,989.41
  6. Step 6: Final answer
    x = 11,856.33

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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.