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Finding the Fourth Proportional to 18,707.40, 28,062.45 and 11,295.90

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Solution

The fourth proportional to 18,707.40, 28,062.45 and 11,295.90 is: 16,944.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.40 : 28,062.45 = 11,295.90 : x
  2. Step 2: Convert to fraction form
    18,707.40/28,062.45 = 11,295.90/x
  3. Step 3: Cross multiply
    18,707.40x = 28,062.45 × 11,295.90
  4. Step 4: Simplify right side
    18,707.40x = 316,990,628.96
  5. Step 5: Solve for x
    x = 316,990,628.96/18,707.40
  6. Step 6: Final answer
    x = 16,944.67

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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.