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Finding the Fourth Proportional to 18,885.92, 28,318.37 and 7,800.12

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Solution

The fourth proportional to 18,885.92, 28,318.37 and 7,800.12 is: 11,695.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.92 : 28,318.37 = 7,800.12 : x
  2. Step 2: Convert to fraction form
    18,885.92/28,318.37 = 7,800.12/x
  3. Step 3: Cross multiply
    18,885.92x = 28,318.37 × 7,800.12
  4. Step 4: Simplify right side
    18,885.92x = 220,886,645.20
  5. Step 5: Solve for x
    x = 220,886,645.20/18,885.92
  6. Step 6: Final answer
    x = 11,695.84

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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.