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Finding the Fourth Proportional to 13,905.76, 20,866.72 and 8,369.76

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Solution

The fourth proportional to 13,905.76, 20,866.72 and 8,369.76 is: 12,559.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,905.76 : 20,866.72 = 8,369.76 : x
  2. Step 2: Convert to fraction form
    13,905.76/20,866.72 = 8,369.76/x
  3. Step 3: Cross multiply
    13,905.76x = 20,866.72 × 8,369.76
  4. Step 4: Simplify right side
    13,905.76x = 174,649,438.39
  5. Step 5: Solve for x
    x = 174,649,438.39/13,905.76
  6. Step 6: Final answer
    x = 12,559.50

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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.