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Finding the Fourth Proportional to 12,487.76, 18,729.75 and 4,694.75

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Solution

The fourth proportional to 12,487.76, 18,729.75 and 4,694.75 is: 7,041.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.76 : 18,729.75 = 4,694.75 : x
  2. Step 2: Convert to fraction form
    12,487.76/18,729.75 = 4,694.75/x
  3. Step 3: Cross multiply
    12,487.76x = 18,729.75 × 4,694.75
  4. Step 4: Simplify right side
    12,487.76x = 87,931,493.81
  5. Step 5: Solve for x
    x = 87,931,493.81/12,487.76
  6. Step 6: Final answer
    x = 7,041.41

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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.